The General Forum is a good place to start, then it's all about expanding your knowledge.
Personally I like the Basics Expanded and Starting Out forums, then it is about covering the basics.
The basics is a list of topics that covers the minimum information realistically need to cast successful spells.
This contains (but varies per individual): reality vs fantasy, meditation, visualization, centering and grounding.
After this you can basically start studying anything you are interested in. Sorry if this was very scrambled.