Going for a FOWLR
setup, 37 gal
Start the process with LR
and some dead base rock, Live sand and some dead.
Use the shrimp carcass method (Do I need to do this if I use Live Rock?)
Ammonia goes up
Ammonia starts to come down, Nitrites go up
Nitrites come down, Nitrates go up
Water change to drop Nitrates
Add cleaning crew
Assuming Ammonia and Nitrites are still zero, and Nitrates are in check, I can add a fish or two.