The search function would be a good place to start for any new user, there is a lot of great content here for you to learn from others like yourself. I purchased a 2011 GT/CS a few short months ago and joined, and I learned a ton that way.
Best place to start is by figuring out what you want to do with the car. Daily driver, Auto-Cross, or Track? Then go from there... Welcome Aboard!
Great choice. Congrats and welcome. There's a lot of people that can help you with just about anything you need. Most topics have been covered numerous times in the past so please make the best use of the search function. Good luck and enjoy your new GT/CS. I know I do.