Yes i recommend a sump
You will need
Tank (reef ready or make it reef ready) and stand
Rocks
Sand
Lights
Wavemakers or powerheads
Heater (controlled)
Skimmer
Sump
Maintenance kit
Water Test kit
Auto top off (is highly recommended)
Quarantine setup ( is highly recommend as well)
A way of getting rodi waters weather its a local store or making your own
Then come all the extras like a controllers, timers, power strips, reactors etc...
Oh and lots of patients
I think i covered everything if not most
Allot of the things is according to personal preference my recommendation is look at some build threads take notes see what you like then YouTube every one of those notes and slowly purchase everything