I recommend using the site's search bar, as well as general internet research. There's a wealth of information out there, although I will tell you not to stress too much on the formality of it; most of my spells are made up on the spot, and they work just as well as my rituals do, generally.
If you're starting out I suggest you do some research and study before practicing. You can also search in the forums whatever it is you're looking for. With study, practice and time you will get there.
Here are some links you might find helpful:
The Basics: Expanded: http://www.spellsofmagic.com/read_post.html?post=483942