thats what your going to have to decide..reef's are a collection of corals that the aquarists design or nature designs in a natural reef in the ocean.. remember thrse corals are live and you must feed them if they are not filter feeders..most corals require a high amount of light..but there are some exceptions, mushrooms, ricordia, some zoa's, sun corals,..some corals require a high amount of flow..(most SPS corals) require alot of flow..
now.. to answer filters and equipment..do you have any experience with saltwater..if not i would just start with the basics..HOB filter..best light i have for that tank is a coralife 28w 50/50 bulb in it..start with 12 lbs of live rock and try some mushrooms and some zoa's.and read alot here..as you learn , upgrade to what you really like for corals.if its just fish only then lighting and flow is not as much of a issue..
Rick