I agree that you have to bet both spots on the turn, but as to how much I have the following thought. If you bet weak, like 1/2 the pot, you are setting yourself up for a raise bluff because it looks like you are nervous about your bet. Can you call that raise if it is sizable (pot committing)? A normal bet of 2/3 t o3/4 pot sounds about right for both plays to me.