I have stats on the villain; however, I'm wondering what is going to be the best play in this situation against an unknown.

Is the flop c/r a bit too small? What's our turn line here for the flush coming in, and for a blank? Thanks.

$0.5/$1 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG ssnon ($346.80)
UTG+1 lessharm ($151.35)
CO omahondo ($123.10)
BTN MrDunns ($104.90)
SB mixen82 ($60.85)
BB Hero ($140.75)

Pre-flop: ($1.50, 6 players) Hero is BB
3 folds, MrDunns raises to $4, 1 fold, Hero calls $3

Flop: ($8.50, 2 players)
Hero checks, MrDunns bets $6, Hero raises to $18, MrDunns calls $12

Turn: ($44.50, 2 players)
Hero ($118.75)?