This is a huge leak in my game.

I am having a hard time playing for draws.

Scenario 1: How would one bet at the pot when hitting a 4 flush draw and NO pair on the board if you were FIRST to act, or LAST to act?

Scenario 2: How would one bet at the pot when hitting middle pair and a 4 card flush?
First and last to act?

Scenario 3: How woud one bet when hitting top pair and 4 card flush?

Thanks.... I really need to work at this, since I seemed to find myself in this situation!!