OK I'll take a shot.

1) I like leading the flop. You raised preflop and are expected to CB so leading doesn't give away your hand, and against one opponent I would bet out 90% of the time no matter what the flop.

2) Since this is a 33 small bet by villain could be anything, AA, crap whatever.

3) Raising to 700 is fine but you could also make a case for many different plays here IMO. Only thing is that the raise may give away your hand which could have been avoided if you had led on the flop.

4) Well I think you know he could have a flush draw but you can't be overly worried about this heads up. The fact that there is a flush draw out there is all the more reason to bet the flop though.

Did I mention I would have bet the flop?