The school of magic does not simply give all its spells for free.
This is a guide to how much they charge and how common a spell is.
I suggest that a first level mage should start with 1d8+2 x 100 commons to spend on spells.

Spells of the First Circle

Spell Name                                            Frequency                               Cost
Affect Normal Fires                                                Common                                               50 Commons
Alarm                                                                      Common                                               50 Commons
Armour                                                                   Common                                               100 Commons
Audible Glamour                                                    Common                                               75 Commons
Burning Hands                                                       Common                                               100 Commons
Cantrip                                                                    Common                                               10 Commons
Change Self                                                            Common                                               50 Commons
Charm Person                                                         Common                                               50 Commons
Chill Touch                                                             Uncommon                                           80 Commons
Colour Spray                                                          Uncommon                                           150 Commons
Comprehend Languages                                         Common                                               100 Commons
Dancing Lights                                                       Common                                               50 Commons
Detect Magic                                                           Common                                               20 Commons
Enlarge                                                                   Uncommon                                           120 Commons
Erase                                                                      Uncommon                                           100 Commons
Feather Fall                                                            Common                                               100 Commons
Find Familiar                                                         Uncommon                                           100 Commons
Friends                                                                  Uncommon                                           100 Commons
Gaze Reflection                                                     Rare                                                      200 Commons
Grease                                                                   Common                                              50 Commons
Hold Portal                                                            Uncommon                                         100 Commons
Hypnotism                                                             Uncommon                                        100 Commons
Identify                                                                  Uncommon                                        100 Commons
Jump                                                                      Uncommon                                       75 Commons
Light                                                                      Common                                           30 Commons
Magic Missile                                                         Uncommon                                      150 Commons
Mending                                                                 Common                                          50 Commons
Message                                                                 Common                                          50 Commons
Mount                                                                    Common                                          50 Commons
Nathan’s Magical Aura                                          Uncommon                                      100 Commons
Phantasmal Force                                                  Common                                           75 Commons
Protection from Evil                                              Common                                           150 Commons
Read Magic                                                            Common                                          15 Commons
Shield                                                                    Common                                           150 Commons
Shocking Grasp                                                    Uncommon                                       90 Commons
Sleep                                                                     Common                                           50 Commons
Spider Climb                                                         Uncommon                                       100 Commons
Spook                                                                    Uncommon                                       100 Commons
Taunt                                                                      Uncommon                                       100 Commons
Teller’s Floating Disc                                            Uncommon                                       100 Commons
Unseen Servant                                                    Common                                           50 Commons
Ventriloquism                                                       Common                                           40 Commons
Wall of Fog                                                         Uncommon                                         80 Commons
Wizard Mark                                                         Common                                           30 Commons
 
Spells of the Second Circle

Spell Name                                            Frequency                               Cost
Alter Self                                                                 Common                                               150 Commons
Bind                                                                        Common(Questions Asked)                 100 Commons
Blindness                                                                 Uncommon                                           150 Commons
Blur                                                                          Common                                               150 Commons
Continual Light                                                        Common                                               100 Commons
Darkness 15’ Radius                                                Uncommon                                           150 Commons
Deafness                                                                 Uncommon                                           150 Commons
Deeppockets                                                             Uncommon                                           200 Commons
Detect Evil                                                                Common                                               150 Commons
Detect Invisibility                                                    Uncommon                                           175 Commons
ESP                                                                         Rare(Questions Asked)                         400 Commons
Flaming Sphere                                                        Uncommon                                           150 Commons
Fog Cloud                                                               Common                                               100 Commons
Fool’s Gold                                                             Uncommon                                           150 Commons
Forget                                                                      Uncommon                                           200 Commons
Glitterdust                                                                 Common                                             150 Commons
Hypnotic Pattern                                                      Common                                               180 Commons
Improved Phantasmal Force                                     Common                                               150 Commons
Invisibility                                                               Common                                               250 Commons
Irritation                                                                 Common                                               100 Commons
Knock                                                                      Common                                              150 Commons
Know Alignment                                                    Uncommon                                           220 Commons
Laylan’s Trap                                                         Common                                               175 Commons
Levitate                                                                 Common                                               200 Commons
Locate Object                                                         Common                                               200 Commons
Magic Mouth                                                         Common                                               100 Commons
Marlow’s Acid Arrow                                          Uncommon                                           250 Commons
Mirror Image                                                         Uncommon                                           250 Commons
Misdirection                                                         Common                                               150 Commons
Protection from Cantrips                                       Common                                               50 Commons
Pyrotechnics                                                         Common                                               100 Commons
Ray of Enfeeblement                                            Common                                               250 Commons
Rope Trick                                                            Uncommon                                           300 Commons
Scare                                                                    Common                                               150 Commons
Shatter                                                                  Common                                               150 Commons
Spectral Hand                                                     Common                                               200 Commons
Stinking Cloud                                                    Uncommon                                           150 Commons
Strength                                                             Common                                               250 Commons
Summon Swarm                                                Uncommon                                           200 Commons
Tanya’s Uncontrollable Hideous Laughter         Common                                               200 Commons
Web                                                                    Common                                               200 Commons
Whispering Wind                                                Common                                               100 Commons
Wizard Lock                                                         Common                                             150 Commons
 
Spells of the Third Circle

Spell Name                                            Frequency                               Cost
Blink                                                                         Uncommon                                           500 Commons
Clairaudience                                                             Rare(Questions Asked)                         1000 Commons
Clairvoyance                                                             Rare(Questions Asked)                         1000 Commons
Delude                                                                      Uncommon                                           500 Commons
Dispel Magic                                                             Common                                               300 Commons
Explosive Runes                                                        Uncommon                                           500 Commons
Feign Death                                                             Uncommon                                           600 Commons
Fireball                                                                     Common                                               500 Commons
Flame Arrow                                                            Uncommon                                           800 Commons
Fly                                                                          Common                                               350 Commons
Gust of Wind                                                         Common                                               300 Commons
Haste                                                                      Uncommon                                           700 Commons
Hold Person                                                         Common                                               300 Commons
Hold Undead                                                         Uncommon                                           400 Commons
Illusionary Script                                                    Common                                           400 Commons
Infravision                                                             Common                                               300 Commons
Invisibility 10’ Radius                                            Uncommon                                       350 Commons
Item                                                                      Uncommon                                           400 Commons
Laylan’s Tiny Hut                                                Common                                               400 Commons
Lightning Bolt                                                        Common                                           400 Commons
Marlow’s Minute Meteors                                     Common                                           300 Commons
Monster Summoning I                                            Rare                                                    1000 Commons
Non-Detection                                                         Rare                                                800 Commons
Phantom Steed                                                     Common                                           300 Commons
Protection From Evil 10’ Radius                          Common                                           300 Commons
Protection From Normal Missiles                          Uncommon                                       500 Commons
Secret Page                                                             Common                                           300 Commons
Sepia Snake Sigil                                                    Uncommon                                       350 Commons
Slow                                                                      Common                                           400 Commons
Spectral Force                                                         Common                                           400 Commons
Suggestion                                                             Uncommon(Questions Asked)            500 Commons
Tongues                                                                 Common                                           300 Commons
Vampiric Touch                                                    Illegal                                                    -
Water Breathing                                                    Common                                           300 Commons
Wind Wall                                                             Uncommon                                       350 Commons
Wraithform                                                             Rare                                                1000 Commons

Spells of the Fourth Circle

Spell Name                                            Frequency                               Cost
Charm Monster                                                        Common                                               500 Commons
Confusion                                                                 Uncommon                                           1000 Commons
Contagion                                                                 Illegal                                                        -
Detect Scrying                                                         Common                                               700 Commons
Dig                                                                          Uncommon                                           700 Commons
Dimension Door                                                       Rare                                                    1600 Commons
Emotion                                                                 Common                                               750 Commons
Enchanted Weapon                                                Common                                               800 Commons
Enervation                                                             Rare(Questions Asked)                         1800 Commons
Emeril’s Black Tentacles                                       Uncommon                                           1000 Commons
Extension I                                                             Common                                               500 Commons
Fear                                                                      Common                                               600 Commons
Fire Charm                                                             Uncommon                                           800 Commons
Fire Trap                                                                 Common                                               750 Commons
Fumble                                                                 Common                                               750 Commons
Hallucinatory Terrain                                            Uncommon                                           1000 Commons
Ice Storm                                                                 Common                                               900 Commons
Illusionary Wall                                                    Common                                               600 Commons
Improved Invisibility                                            Common                                               1000 Commons
Laylan’s Secure Shelter                                       Common                                               800 Commons
Magic Mirror                                                         Uncommon(Questions Asked)            1400 Commons
Massmorph                                                         Uncommon                                           1000 Commons
Minor Creation                                                    Common                                               550 Commons
Minor Globe of Invulnerability                          Common                                               750 Commons
Monster Summoning II                                       Rare                                                    1500 Commons
Owen’s Resilient Sphere                                       Uncommon                                       1000 Commons
Phantasmal Killer                                                Illegal                                                    -
Plant Growth                                                     Common                                               600 Commons
Polymorph Other                                                Rare                                                    1500 Commons
Polymorph Self                                                    Uncommon                                       1200 Commons
Rainbow Patterns                                                Common                                           600 Commons
Renard’s Mnemonic Enhancer                           Common                                           650 Commons
Remove Curse                                                     Common                                           500 Commons
Shadow Monsters                                                Common                                           1000 Commons
Shout                                                                  Common                                           500 Commons
Solid Fog                                                             Uncommon                                       600 Commons
Stoneskin                                                             Rare                                                4000 Commons
Vacancy                                                             Uncommon                                       650 Commons
Wall of Fire                                                         Uncommon                                       800 Commons
Wall of Ice                                                         Uncommon                                       700 Commons
Wizard Eye                                                         Uncommon                                       900 Commons