$3/6 55, overs flop

[Womble]

Party Poker 3/6 Hold'em (6 max, 6 handed) converter

Preflop: Hero is Button with 5[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, MP calls.

Flop: (5.33 SB) J[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets</font>, MP calls.

Turn: (3.66 BB) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, Hero checks.

River: (3.66 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP bets</font>, Hero calls.

Final Pot: 5.66 BB

MP was loose so wanted to isolate. Do i do this for anyone who just calls? What do I do on the flop onwards. Easy flop bet to try and pick up the pot but the turn/river was awkward. I called the river since I though he may be bluffing and think I have overs since I checked the turn.

Whats the thought process on the turn in these situations