to answer your question on what you'll need to get things going, heres a checklist that will put you in a good path towards getting livestock. i hope i didnt leave anything out, this is what you'll need for a nice, functioning basic setup.
-Stand for your tanks, with room for a sump underneath unless your putting the sump in anoter location and/or putting tanks into the wall
-Return pump for sump
-RO/DI unit ( and food safe tub/drum for water storage, extra heater and powerhead for pre-mixing saltwater)
-Sand, Live rock
-Reef salt mix
-A product to dose cal,alk,mag (only put something into your tank after testing)
-Skimmer ( read online reviews and i wouldnt skimp here )
-Test kits for amm, nitrtite, nitrate,pH,cal,mag,alk,temp. at the minimum.
-Plumbing, PVC piping, tubing, bulkheads... misc. plumbing parts depending exactly how you want to plumb it to your sump
-Electric ( powercords, timers .. )
-Heater(s) and/or chiller(s) depending on where you are in the world
-Lights, and if keeping corals even better lights. I suggest a t5 or halide setup for corals. ( not a need from the start as you can wait until the tanks cycled )
that sounds like about the basics to get your tanks on the right path for livestock. hope it helps, feel free to ask any questions you have.