Questions about TOP

[fulltilt]

In TOP it says that if you hold lets say AhKh and the flop comes for example, Th5s7h that this is a very strong hand and that u should play aggresively.

Lets say u have no real read on the table- really general loose play, nothing too passive and not too aggresive

Should u be re-raising someone who bets before you? Is that EV+? I mean, lets you are last to act and 3 people have called a bet from UTG. Should u raise or call? Since ur supposed to hit the flush a little over 35% of the time, u should be raising and reraising the flop, or just calling?

Thanks.

fulltilt