You will definately need a protien skimmer. If you decide to use a sump or refugium you should get an in-sump skimmer.
Lighting, the more the better. I've heard that you should have around 5 watts per gallon. The HQI's are nice, I settled on a Power compact though, cheaper. Just have to watch your tank temp since it's a smaller gallonage.
powerheads are optional, just as long as you have good water flow, about 20x-30x flow. On a 36g tank at 20x flow (20 x 36) you need 720gph of flow.
With the correct lighting, great h2o flow, and pristine h2o parameters, you should be able to keep most corals.
Keep researching on this site before you make any decissions yet. I read almost every thread on here for a month straight before I even bought anything.
GOOD LUCK