Help me correct a couple leaks

These are the things that I'm currently struggling with in MTT play at my levels.. any advice would be great:

1.) Top Pair out of the blinds.. when I have top pair (like Ace rage on an Axx board) out of the BB and there's 2 others involved in the pot, how much should I be betting to see where I stand? Should I value bet or should I just see if someone else has an ace? (And if they do they surely have me dominated).. I see myself losing a good amount with this play.. or let me rephrase and say that I lose more than the minimum (since I have to make a play when it's my turn to bet, right?)

2.) Min Re-raises against my MP/LP hands.. when I have JK or something out of 4th + position, I play for a raise and at micro levels get min-re-raised.. now.. I have like 6:1 odds to call, and there's no hand that would put me that behind.. but I basically know he has a Premium Pair and im dominated.. do I still call knowing that Im gone if I don't hit a straight or two pair?.. or do I conserve?(assuming I have a medium sized chip stack, like 15-20BB)