First you need a 150 gallon tank with a sump, protien skimmer,.... Kidding although you will probably end up with them at some point in time... If you've never had a reef tank before start with an RODI filter with auto shut off float switch, do not use regular tap water... hydrometer, saltwater test kit, Salt, Sand, Rock, power head, heater, bucket and patience.... Oh yeah and a red light to watch your tank at night for a world you never knew existed.
Get a book read it, you most likely wont understand what it says until you start experiencing things going wrong and you witness the changes when the parameters are adjusted. Read, ask more questions, research the answers you get, don't blindly follow everyone's advice. Don't use live fish to cycle your tank, when your tank is cycled populate slowly allowing the bio filtration to catch up. Research the fish tank size requirement before you buy any fish or animal. Everything here is my opinion and most everything you will get from people are opinions too, remember this and you will have a great piece of the ocean to yourself...
Not sure if that's what your looking for, but good luck