The Gods and Goddess
There are different Gods for all sorts of different things
Gods are usually called apon during the day.
I will name a few Gods for you and what type of spells the can help you with.
The horned God: God of the sun. can help you with spells dealing with courage, srength, money, prosperity, health, success, creativity
Apollo: Greek god of the arts, prophecy, medicine, and light.
Protector of herds and flocks.
Thor: The God of thunder
Odin:  The God of war, wisdom, and poetry.
Cronus-God of Saturn, can be useful for spells dealing with manifestation, concentration, maturity, to neutrilize evil intent, longitivity
Osiris:  God of  firtility
Godesses are ususally called upon during the evening hours.  Here are some Goddesses and different types of spells that they can help you with.
Diana-Goddess of the hunt, of the Moon, and of cahsity.  she can help you with spells dealing with psychic ability, beauty, dreams, astral travel, protection and intuition
Ceres-The Goddess of grain and agriculture.  so she can help you with spells dealing with plants (trying to grow them or make them healthy)
Cybele-Nature Goddess.  So she can help you with spells having to do with nature.
Athene-Greek Goddess of wisdom and arts

Astarte-Goddess of love so obviously she can help you with spells dealing with love
Ishtar-Goddess of firtility and love