if you have the right lighting and water movement you can pretty much start with some easy softies fairly soon after you have cycled.
Shrooms, leathers, and Polyps are great to start with.
I would suggest waiting at least a little bit until you get a hang of keeping everything stable, also you can expect some minor algea break outs that new tanks go through. Algea can grow over the corals. Just keep on top of your tank and you should be fine.
After 2 months I started adding Corals. My tank is now just 3 months old with a bunch of corals and is doing great. I am always looking for a nice piece to add to my tank.
Good luck