do you have prior experience w/ SW?
start by filling the tank w/SW and a heater.
go to LFS/online and get ABOUT 70 lbs of rock, i'd say like 20:50 live to base
setup the rocks in your tank,
add substrate (live sand, aragonite, crushed coral, sand.....)
allow to sit and cycle for about two weeks
add maybe like 5 damsels
cycle another two weeks
start adding hardy species like clowns, grammas, hawk fish, squirrelfish, wrasses, jawfish, gobies, blennies, cardinals..........
if you want one "big" fish wait 3 weeks after adding rocks and add the fish.