First, I'd start with some light reading of these guides:
www.ar15.com/content/guides/Those will give you a good foundation and will show you how to maintain your rifle. There's also a few exploded parts diagrams that will show you where everything is and how it fits together. I would recommend printing them out and walking through each step by step with your (
UNLOADED) rifle in front of you so you can see how it all works in action. Work the action, dry fire it a couple (hundred) times. Get used to the feel. After you've done that, you'll probably have 50+ more questions.
Just so we're giving you sound advice on optics/accessories, what do you plan to do with it? Is it going to be a hunting rifle, if so, what're you hunting? Predators, deer, squirrels/p-dogs? Is it going to be a plinker for popping cans, paper, etc from relatively short range (<200)? Will it be a precision scoped rifle (for hunting or target) for longer range (>200) targets? Or does it need to be a relatively all-purpose rifle that can fill the need for each.
If we know what you're primarily going to use it for, we can suggest optics, accessories, ammo, hunting locations/tactics, shooting locations and anything else you might want to know.
Ask away!/