How much rest between sets??

[Hypertrophy]

Yes, typically a bigger muscle is a stronger muscle.
Ronnie uses very light weights, he says it after every set, "that was light, real light."

[carbs-rule]

I would reccomend rests that correspond to getting back to a fairly normal heart rate. It usually takes around 90 secs. If you have a heart rate monitor, it is easy to check. You can estimate it by hand too. A heart rate monitor is awesome regrdless, you know almost exactly how many calories you burn and can keep track of your heartrate constantly.