You make your post flop decisions with AA much easier by RAISING PRE FLOP. When you limp in and then stack off on any flop, you give everyone at the table insane implied odds to play against you. As a beginner, you should be looking to raise any pre flop bet before you when you hold AA, it's the easiest way to play AA and it's usually the most profitable. Just fucking raise, don't get cute with AA because it often ends in tears.