With effective stacks at 12-16 or so you want to be looking for opportunities to reraise all-in preflop, with less than 12 you want to be looking for opportunities to shove. You only want to call with very strong hands, but your raising range can be pretty wide. So raise light, call tight. The # of players to act and their stack sizes are the primary determinants in your actions. You want to be stealing a lot from people who can afford to fold, but you need a mucher stronger hand than pot odds
against range dictate close to the bubble to be able to call, which is why you can steal a lot more. Against people who can't afford to fold, you need to raise tight still.