The basics would be LR, LS, skimmer, and a powerhead(I'd do a Koralia nano or #1). It depends on what you want to spend and your plans for the tank. There are tons of options out there- canisters, wet/dry, sump, fuge.... I would try to find a local reef club and a LFS (that you can trust, not a chain) to give you hands on advice. This is a hard question to answer as there are so many variables.