The best thing is patients with dealing with saltwater. I researched for over 6 months before buying my tank and I do extensive research before buying livestock. I've only been in the Hobby for a year and a half and I feel like it'll be at least 20 years before I can consider myself a novice with all the stuff that has to be learned. Don't get discouraged with your tank our pass decisions, it takes time and patience. Only add 1 fish after cycle and I always waited at least a month before adding another. Every fish you add, it adds a additional bioload to the tank and you've got to give it time to catch back up. There's a certain limit that the tank can handle, when you purchase a fish, look it up and find the adult size of that fish and base your system on that, that on actual size. They might be babies when you first get them, but they're going to get big. I see a lot of people who buy fish that isn't right for their system with plans of getting a bigger tank later down the road, don't make this mistake either. Only buy for your current setup, if you ever upgrade, buy the ones that is right for that system then. Good luck with your tank and remember ask questions and do research, don't trust the fish store, they mainly want your money.