I would highly recommend (as someone who is about 2 years into this process also), that you master the salt water fish keeping before trying corals. Firstly you need an entirely different lighting set up than what comes standard with normal tanks that is about $400 so unless you purchased that when you got the tank, I would save corals for later. Also a lot of fish species and invertebrates you may add to your salt tank aren't compatible with corals and will just eat them and waste your money so if you haven't already started putting salt fish in your tank and you really want to do corals, be sure to ask around and do your research before you buy fish that will prevent you from having a reef/coral tank.
My best advice would be go really slow with the whole process......friends have been watching me build up this tank for a year and a half and keep asking why I only had rocks and sand in it for a few months, then why I only had 2 fish in it for a year, and my answer was always "you cannot create the ocean in a box very easily, and not only are salt water fish less sturdy than fresh water, they take more space, they need well established water quality and an ecosystem with the live rocks and sand and bacteria going before you just plunk a bunch of them in there and hope they live, because they won't." Patience is a virtue here and I believe that is why every single person I've known to try to start up a salt water tank gave up after a few months, complaining that all their fish kept dying. I've had the tank up about 18 months now, I have 5 fish and two hermit crabs and it's starting to look a lot cooler but more importantly everything I add, stays alive. You don't wanna drop $50 or more on a fish and have it die a week later.
