Quote Originally Posted by optimists
1) UTG. How much to bet is good? And what to do if someone re-raises you substantially?
2.1) MP. If UTG raises? Should I normally (theoretically) just call or re-raise?
I don't think anyone is able to give you a universal recipe on how to play AK from various positions, as it is always opponent-dependent. AK is a very problematic hand pre-flop and I've seen many experts offering quite contradictory advice.

You should think more in terms of ranges. Instead of being stuck thinking about your hand and your position (which are, of course, important), concentrate more on what your opponents might have.

Quote Originally Posted by optimists
2.2) MP. No raise before. Should I bet more or less than in point 1?
I would usually bet just as much in MP as in UTG. But if it has to be either more or less, then bet more. Two main reasons: 1) There's a smaller chance that people behind you get crazy and make you fold. 2) You have a slightly increased chance of being in position post-flop, and when you're in position you want the pot to be bigger, on average, as compared to when you're out of position.