Not that I'm an expert by any means but you played all but 2 of them the way I would have. Anything less than pairs of 10 I always limp in or call up to 4 or 5 times the big blind. If I don't flop the set then I usually fold to anything but the minimum bet unless the flop is total rags and I have the high pair. Also if I think I can see the turn card really cheap than I will especially if I only limped in.

The hand where you hit your set of twos and you had someone bet 50 and call 50 ahead of you......this is where I would've tried to draw more money out of them by just calling. Depending my position I would either check if I acted first hoping one of the 2 would lead out and bet and then I would either raise it or go all in then. I will usually only do this if the flop comes rainbow though after I've hit my set. If there is a flush draw on the board then I would raise it big or go all in right after the flop.

In regards to your hand with the QQ, I would have played that one differently too. I would have probably just called the amounts bet (they were sizable raises already) for fear that I was up against AA, KK (dominated) or AK (coin flip). That way I get to see the flop and see if any scary Aces or Kings come off. If everything still looks good then I would go all in. However If someone goes all in after the flop ahead of me then I would be thinking long and hard about whether he had an AA or a KK. If I knew him to be a very agressive player than I would probably call. But otherwise there is a good chance I would fold rather than risking the rest of my chips. Now it did work out for you this hand because you got lucky and hit the flush. However you normally would've been beat because one of the guys hit a pair of Aces.