Opposed to what I usually do, I'm just gonna smile and give you a few pointers:

a) there is an Avatar videogame, and a ton more at nick.com

b) this belongs in the "Ask a question get an answer thread." If you click on the forum tab and look at the top you should see several threads that have pieces of paper with thumbtacks in them. This thread will always be there. You must use those threads instead of creating new ones, whenever at all possible.