OK, here's what I suggest, assuming you're going with a plain vanilla 5-man rotation:
1) Pick the five guys who have the best STA, and DUR of at least 20, as your starters.
2) Add their DUR and STA together (use a calculator... the total might get up to three digits!) then round it off to the nearest 5. So 102 would become 100, 103 would become 105, etc.
3) Set the TPC (Target Pitch Count) to that number.
4) Set the MPC (Max Pitch Count) to that number plus 10.
5) Set the Rest numbers for all five to 90.
6) After a couple of turns through the rotation, if any of them aren't back at 100% by the time their next start comes around, trim back their TPC and MPC by 5. Keep doing that until they stop showing signs of fatigue.