I had one for many years when we lived in Hawaii. I had good luck with Instant Ocean and tap water, but would sometimes get makeup water from the Pacific itself. I caught some animals myself but relied on the fish store for most fish.
When setting up a new tank I used a dozen Black Mollies before introducing more expensive fish. This was because they can tolerate the spike in ammonia levels till things get settled out. High ammonia will kill the more fragile reef fish.
Leave the tank run with the mollies for a few weeks to let the chlorine and ammonia levels to come down, the introduce some of the more tolerant reef fish. Stay away from the Tangs, as they are tough to raise imo.