I'm sensing a rushing new hobbiest, honestly caring but really pushing things too fast........
Let the tank mature at minimum a month before you even think of corals.......nothing is stable yet, barely even cycled, so enjoy the yellow tails (good choice by the way, other damsels like the white spot or solid black ones are much more aggresive) but really do wait for any corals otherwise you most likely will start killing stuff, get frustrated, buy more stuff, see it waste away, and then get more frustrated.
First corals should be some mushrooms, maybe a leather, and other soft corals.
Really do plan out what your long term goals are, as introducing a aggressive fish now can really limit your coral choices later.
Good luck, GO SLOW, read up and learn, be patient, and GO SLOW!!!