Congrads and I am glad you are here. Welcome to AF!!!
Being one of the guides and that I have a Atrix, if you (or anyone) ever has a question or needs help, I am here to help. Remember there are no stupid questions except the ones not asked, so you can always post or PM me a question and I will do my best to answer.
As for where to start... That is a good one. What do you want to know more about? and What is the main reason you got the phone