I had my tank cycling for 2 months with damsels in them, you need to have some time of die off or something to spike your ammonia and to cycle your tank. I have heard of people using shrimp but a tank can not just sit there and cycle. You need to wait until the cycle is done and then add your corals. It may take a while and be frustrating, but it is very rewarding the first time you go to the fish store and buy your first coral. I recommend toadstool leathers as your first coral. It is my favorite coral and it is very hardy. Toadstools are also very finicky, they may be ****ed off one day and not want to stand up or open up like it did the other day but its a earning experience and you will soon learn what they like. I also suggest that you use Marine snow 1 time every week to give them extra nutrients. Also, make sure that your lights are antiquate enough for you to keep corals. Without proper lighting the corals wont be able to photosynthesis. I do suggest that if you get a toadstool that you get 2 clownfish. The clownfish in my tank host all 3 of my toadstools and pretty much help the coral shed by rubbing all up on them.
The first 2 pics are of my tank now, and the last one is a pic of my tank 1 years ago.