2) re bet sizing, at 10nl, i'd raise to 0.30, be it from utg, or from the button or whatever. 0.30 would be my standard open, or 0.40 if there's a limper. if there's 2 limpers just bet the pot if i'm raising.
Don't auto c-bet from the button. Think about what you think your opponent has and what your opponent thinks you have. If you're constantly getting looked up with c-bets, lower their frequency, or even postpone them to the turn.
Also, often players will lead into you after a button raise. don't give these up so easily. be hard to play against.
You raise QT on the button, and get called, pot is 70c and the board comes 552 and villain leads into you. ok, you;ve missed, but has he really hit that board? if you're going to rereaise, say he leads for 40c into 70c, dont click it back to 80c, make it 1.05 or something similar.
3) As you move up this leak will get bigger and bigger. The sb is there to be folded. That 1/2 bb is going to be lost to rake anyway if you win, so just accept its gone. Play TIGHT TIGHT TIGHT from the sb. if its folded around to you and you have 85off against a nit in the bb, betting 25c might win the pot this time, well done you won 10c. And maybe next time too... but then he calls. flop is K84, do you cbet? Do you bet 35c? if he reraises you gotta fold? if he flats are you double barreling into a nit? losing more? in short, fold the small blind.