how do you play this game
you can't control your opponents odds
say you got AA and flop is all Axx all suited. Your calling station opponent can just call the minimum raise from you. Can you only win by +EV for the sole reason that your AA should win most pots?

There is room for some moves, but basically it is taking advantage of pot equity and maximizing your profit on each street.

Sometimes it will be better too call on the flop in order to bet or raise on 4th street when your pot equity is better (or fold or call down in the card is bad).

In your specific example of Axx all suited and you have AA, In early position I would usually check and then raise when someone bets to make people face a double bet. This will get out anyone that didn't flop a flush or has the Q or K. It's VERY unlikely that anyone but those three hands will stick around to a double bet with that board (except the other Ax which you will beat anyway.)
You might win the pot, or likely itsheads up and then you can keep betting if a blank comes or call it down if you are played at since you have redraws to a boat. Just betting out doesn't protect your hand. There are ways to manipulate in limit, in fact I think this is actualy easier to play this hand in limit than no limit.

My sister isn't very good at NL(break even, small winner). Should I suggest Limit?