Suited connectors/ one card stright

[Mvcode3]

I need some help on this hand, UTG is a total fish, Button is LAG, i dont know if i should have been more agressive, less agressive or fold.
Party Poker 5/10 Hold'em (6 max, 6 handed) converter



Preflop: Hero is CO with 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, Hero calls, Button calls, SB completes, BB checks.

Flop: (5 SB) 6[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, SB folds, BB folds, <font color="#CC3333">UTG 3-bets</font>, Hero calls, Button calls.

Turn: (7 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, Button calls, UTG calls.

River: (10 BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, Hero checks, <font color="#CC3333">Button bets</font>, UTG calls, Hero calls.

Final Pot: 13 BB