1) Fine
2) Make a real bet on the flop. You gave up on this hand and cost yourself money.
3) DONT FOLD SETS. Even if by some miracle he's flopped a flush or turned a straight you've still got 10 outs. DONT FOLD SETS.
4) I dont even know what to say here. Folding the river was retardo, and I probably raise the turn about 85% of the time.