[chaos]

It is not clear whether you are asking about play on the flop or play on the turn.

If there is no low possible yet, your opponents likely have strong high hands to be betting and raising. In general I would not be putting in raises with only a nut flush draw. You only have a draw. There is the chance that you make you flush on the turn only to have the board pair on the river giving someone else a better hand. There is also the chance that you make your flush and someone else makes a low so you are only playing for half the pot.

Do not draw for flushes on a paired flop. As you said in your post, you can be drawing dead.

On the turn you have two types of out. Outs that give you a nut flush without pairing the board or putting three low cards up. These outs will win you the whole pot. You may also have outs that will give you the nut flush without pairing the board but put three low cards on board. These will win you half the pot.

I generally do not try and count outs at the table for play on the flop. There are simply too many two card combinations.