In one workout, you do the main work, then the mid-top, then bottom-mid then one assistance exercise.
After the three weeks are up, use the top set you did for each rep scheme. Add 1 set per week per rep scheme until you do 5 sets w/ your top set.
Weeks 1-3 would be 2x5 2x3 2x2
Weeks 4-6 would be 3x5 3x3 3x2
Weeks 7-9 would be 4x5 4x3 4x2
Weeks 10-12 would be 5x5 5x3 5x2
Then retest your 1 RM on week 13 or 14 or start over w/ Phase 1.
Unless you need to warm up, I wouldn't bother with it. Just start to warm up using the bench press for bench press day. Try it both ways and see what happens is all I can say about that. Whatever works.
I don't really have any sound experience to give advice on the OHP or barbell rows since they are not a power lift and I don't really train them often and only use them for assistance sparingly. If anything I would say mix up the rep schemes and intensity in a similar fashion as the bench. I would probably run the rep ranges for those lifts more like 10,8,5 or 8,5,3.