Right I know I'm not one of the top players, I don't put nearly enough time into it online to be one but hey, everyone can't be perfect. Now I've analysied the advantages and disadvantages of each class and the technicalities of the game (which after writting this most likely they will be changed so I can't exploit them)
Fighters: Big, tough, beat you down and stomp around sort of guys (and gals). Not particularly subtle people, (and keeping in character) hardly what I'd call intelligent, in general. These people have the strength to swing those damn scary swords of theirs around while wearing all that armour, that much steel must rot ones brains. Tsk
Theives: "Get the hell away from my wallet!" Pesky, annoying people, a lot more, shall we use the words, discreet with their dealings? Attack from the shadows, wear lighter armour than the fighter for greater allowance for movement, but they still have those annoyingly big swords. Gah, do they all think you have to walk around with a sword swinging back and forth to prove your a man? Well all I can say is they're more intelligent as a group than fighters, at least they attack from more than one side.
Mages: Ahhhhh, my own dear class of people. My aren't we an intelligent lot, educated, sophisticated, clean... that sort of thing. We have knowledge of how to heal ourselves and cast spells of protection over us and our fellows. Our magic is more impressive than any of those crude barbarians, that are writ above, swords. We have the very elements and death itself at our command. We are the way of the future.
Priests: I have nothing but respect for these warrior-priests. Usually, unless they are utter fanatics to their cause are generally clean. They keep records and knowledge almost and some say better than us here Mages. No doubt one of them is working on a similar scroll as this very one. Their devotion and education is a welcome relief in the Inn (yes some orders are allowed to have a drink or twelve, some of the best drinkers I know were Priests, ohhh they were great fun.)
Now, down to business.
The way one must progress through life to get the best out of it is this.
You must while still young begin studying to become a Mage, a most honourable profession, although I have known quite a few who got into little tiffs over slight spell casting differences about whose way was better.
Or, as despicable as it sounds, become a fighter, smash your way through crowds of people, build up that strength and learn to Hurt.
Next once you master your first profession, it shouldn't take more than 10-15 years (that would be about right if it was real time) you should beging the undertaking of learning the other.
An alternative to this for Mages is to become a theif and learn to fight with deceptive strength and let everyone fear your skill with magic and the blade, then become a fighter.
For the Fighter, after you learn your skills with the mind, it's back to the street with you, attacking from the advantage of the shadows and stealing what you can.
Then once you have mastered, both ways of the blade and your mind, it's time to take to your religion of preferance, I'm sure mine will be one that doesn't have rules against drinking, wenching (how will Lily live without me?) or killing, I have to fight the forces of evil somehow.
So that is for Fighters:
Be a Fighter, then a Mage, then Theif and then become religious and join the Priesthood.
For Mages:
Mage, then Fighter or Thief, then the other, and again become a Priest (finally clean baths once more).
For Theives:
Thief, then you really should learn magic so become a Mage, then a Fighter and again a Priest.
For Priests:
What the hell are you doing here? But anyway I suppose you need my guidance, the gods speak to me you know, sorry I couldn't help. You should become a Theif or a Mage, then the other then a Fighter, maybe you will be wanting to go back to your order after that now won't you?
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Chaotic Bane
Insane Death Mage
Also becoming a scholar
of some repute.