sorry but here's another reading material but it will provide many answers to your question.
The Supreme Guide To Setting Up A Saltwater Reef Aquarium Introduction The marine environment is one of the most complex systems on the planet. The aquarium you are about to set up is only a tiny sliver of the vast ocean, but it is nowhere near simple. This task is going to take patience, a...
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But the basic equipment would be powerhead to move water inside tank around the live rock for bio filtration, don't need a skimmer at this time. Heater, lighting and if u want a mechanical filter (prob can reuse from fresh water after cleaning/disinfecting). As long as you keep up with regular water changes, tank should be good with minimal filtration. As tank matures w more livestock, then you can investigate/look into skimmer or sump filtration. Oh, don't forget test kits, must test for nitrate, phosphate, alk, calc and salinity for tank maintenance.
GL