The only question that I can answer is the first one, about your preflop raise. At least I'll tell you what I do. Since we're talking about pocket AA position is relative because you'll raise with them anyway even in EP.
If the game is typical and the pot is unraised, just use the standard table raise, which is usually 3BB. By typical I mean a game that is not too loose, in other words with too many players contending every pot.
If the game is loose, with many people calling even when the pot is raised, then you must raise more than the standard, even if you might be giving away your hand, because with AA you don't want too many players in the pot (against 1 player AA wins 88% of the time, against 2 it goes down to 70%, against 3 its barely above 50%. When you lose with AA, more often than not, it'll be expensive so you want to isolate 1 player).
If the pot has already been raised, and the game is loose, you MUST reraise, at least another 3BB, even 4 or 5. Use your judgement, remembering that your goal is to isolate the 1st raiser making everyone else fold.
If the game is typical and the pot has already been raised there are some options. You can reraise, or, if you're on the button or the cutoff and you think the remaining players will probably fold, you can just call and hope to trap him if the flop looks good. I occasionally do that in tourneys. In a cash game I'll always reraise no matter my position, but many do it there too so its up to you.
If, instead, you're in EP and a player to your right has raised the pot, you should, IMO, reraise every time, even if the game is typical.
As far as how to play AA after the flop, 4th and 5th street, there are too many variables to consider. The most important one is your opponent(s). Are they aggressive? Passive? Do they chase their draws even if they don't have the right odds
? Are they vulnerable to check/raises? Do you have a good read on them? etc.
Other variables are flop texture, who is first to act, your betting patterns, etc.
I know you're probably disappointed with this reply but if you give more details on some of the variables, particularly the flop, you'll get some better answers from other members too. Without at least that its impossible to answer because if, for example, the flop has 3 to a flush or if its Q-2-2 ( which is a great one) you wouldn't bet the same way.
I hope this helped you.