First of all, welcome to the community!
Kindred had started a great thread
on things that he wished he knew when he started, and it has a lot of really great tips for new folks, so I'd definitely read through that.
Second, if you have a question, don't hesitate to ask it! Be sure to utilize the search feature at the top of the screen first; a lot of times a question might have already been asked and then fallen down a ways, so you might be able to get your answer that way. But if you can't find anything, you can start a thread to ask, or skip that entirely and ask a contributor directly.
Third, make sure you're having fun. There's a lot of great things this fantastic community has to offer, so jump on in and have yourself a good ol' time.