JJ advice on all streets welcome

[fslexcduck]

ok so playing online again, just deposited a bit of money and gettin back in the swing of things. ps i am pretty damned sexy. villain is very good and tricky, definitely likes to make moves.

please advise on all streets i think i fcked this one up pretty bad yo. stacks be like 400ish

i have J [img]/images/graemlins/club.gif[/img] J [img]/images/graemlins/spade.gif[/img] in SB. co makes it 12, i call, bb calls.

flop (36): 3 [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/spade.gif[/img]

i lead 20, bb calls, CO calls

turn (96) 6 [img]/images/graemlins/diamond.gif[/img]

i lead 88, bb calls, CO folds.

river (270): T [img]/images/graemlins/diamond.gif[/img]

i check, bb bets 140, i do what exactly?

what should i have done on flop (i realize i should have bet more if i was going to bet, multitabling stupidity) turn? now?