In poker there is no general play for a hand, no one can tell you when you have this do this and if you have that do that... no! it is more complicated than that, poker is a game of positions and being at different position dictates your acts differently. But in this particular case, AA is a strongest hand that you can get as a hole cards and have at least 80% chances to win a hand before the flop.
there is lot of ways to play them,i mostly play this way, tournaments micro and FR, raise 3-4bb from every position, if you get re-raised move all in, you'll probably bet called by AK KK or in early stages by any pocket pair, so you are a huge favorit even against a kk you are 80%
Another thing i like to do is at the loose table in early position when i know that someone will raise i just limp, when someone raise i re-raise, now i would do this only if im long at the same table and i know that play is really loose, in any different situation this would be a bad idea.
If play gets after the flop, you gotta see what is on the board and decide what to do next, is the board dry is the board wet and then act.
I would recommend you to read some beginner strategy article here, they will help you a lot with some decisions, or if you have time, read books there are a lot of situations explained at doyle super/system, harrington on nl holdem etc.