First you need to really learn all the Basics. Second it's best to write your own spells. Why? Because the spells you take the time to write and cast will work better because you will be using all your own energy.
Here is a list of the Basics
The basics Tools,Meditation, Visualization, Focus, Moon Phases, Colors, Days, grounding and centering, power flow, Elements, Circle Casting, Charkas
This link is for the Basics