I just started in saltwater too. In a 10 gallon. Fish only with live rock right now and doing good. It has two clownfish and a small cleanup crew of 5 hermit crabs, 2 peppermint shrimp and about 4 snails or so...
I have a small 50 watt heater, a HOB filter (for a 20 gallon tank), a 110gph...