Betting a draw OOP

[Spicymoose]

First hand at table. Villain is LAG.

Party Poker 10/20 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with 8[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">2 folds</font>, Hero checks.

Flop: (2.50 SB) A[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, MP calls.

Turn: (2.25 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, MP calls.

My plan is to bet any blank river, check/call any 8 or 3, and bet the flush. How is this line? What do you change if villain is pretty passive? Check fold a blank, 8, and 3?