Don't stress over 50NL too much, it's not worth it. This isn't to say I'm killing 50NL yet. Rather, I lost 5 buy-ins within my first hour and half when I moved up.

I've found that If you have TPTK like AK, you are not going to get pair off a whole hell of a lot. Hands that you beat are scared of you having TPTK, so they are not going to be raising the hell out of the flop. Which means, you need to be a little bit more passive towards raises when you have one pair, don't commit your whole stack unless you think he's bluffing. With TPTK, bet out the draws, but look for cheap showdowns because there's no need to loose your stack everytime to a set.