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 powerhead and about 16lbs of live rock. I use a 18" T8 bulb that I bought from walmart for $7.58 that is a 6500k for about 8-10 hours a day.
I cycled with no fish using pure ammonia and it took 21 days. Now I check every 3rd day for ammonia, nitrites and nitrates and do a small 15% partial water change every time my nitrates are above 10. I keep the temperature at 78F and my sg
is 1.024. I have the yucky brown diatoms that come after a tank cycles and I am loving it, it shows health. I have not yet decided if I want corals but if I do, it won't be for a while yet and it would only be easy ones like zoanthids and I would upgrade my lighting
Welcome to AA, I hope you go for it ... just go slow and it can be done!