Start with the bar, crank out 3-5 reps, add 10lbs, and repeat. Do this untill you can no longer perform 3-5 reps, then drop the reps to 1, and continue adding weight in incraments of 5 and 10lbs.
Yes. The most reps you should perform are 10, and the lowest(or heaviest weight) you can use is 6.
If you can't complete the minimal amount of reps, then lower the weight untill you can. You should be reaching momentarily muscle failure. Meaning the last rep should be tough as shit.
60-120 seconds should be fine for each exercise.
Yep. If you can crank out more than the maximal amount of reps, add weight. Strive to increase the load as often as possible.