welcome to TRT! that is no where near the smallest tank. there are many much smaller ones around here on the forum, even a 2.5 gallon i believe. as for suggestions, get a skimmer, try to get one rated for much higher than your total volume, and your gonna need great lights, pcs are the cheapest but wont keep some of the harder corals, all the way up to metal halides, look around at prices and the the biggest and best that you can, even if you have to wait a little longer, it will be well worth it. for fish, i would say 2-4 small fish, depending on which ones you choose.
if there are questions, the reef tank has someone with an answer, and if no one knows the answer, everyone will try to help and learn the answer together, you found a great place here. hope you like it.