i would bet 4 on flop and maybe 12-14 on the turn.

although honestly i think with his smallish stack it's unlikely you're going to get away from this anyway. the only advantage is if you were to bet like this and he flat called you on the turn, and then pushed river he would have enough $ behind that you could fold to an ugly river (ton of cards you don't want to see, and even without that you're not sure where you stand - could save you money in a hand you might already be beat in).