Help with stocking fish for first saltwater tank

I have a red and a black scooter, also a yellow watchman blenny. If you want any of these get them First. That way you can spend time getting used to you and the tank. My red blenny eats mysis, brime [frozen], live brine, and pellets [ spectrum Thera+A ]. My black eats all of that but not the pellets. The watchman eats everything. When I got them there were no bigger or aggressive fish, it is a docile fish tank.