Well, the weight may or may not be heavier next time around. It depends on your strength gains really.
Keep in mind that if you start using submax 15s after using heavy weight in your previous program, not much is going to happen. You must decondition the tissue before lighter loads will produce a growth stimulus.
If you aren't going to decondition, you could probably start with your 10 rep range.
Generally you'll go 6-8 weeks. 15s, 10s, 5s, eccentrics, each for two weeks. If you can't do eccentrics, continue with your 5RM for 2 more weeks.
In principle, you continue with your heaviest loads until they are no longer affective/feasible. Then decondition the tissue so it will respond again.
If you are a long time lifter, you may want to shoot for the same training volume as you used training each bodypart once per week. Just split up those sets over 3 different workouts. If necessary, cut out auxiliary exercises rather than sets.
Hope that helps.