@10x- 1800 gph
@15x- 2700 gph
@30x- 5400 gph
Keep in mind this is total flowrate ( powerheads plus return filtration pumps) you could just about hit 5400 with a mag24 and 2 koralia 1400's.. Not hard
As for skimmers, youll need a pretty decent sized one. (spring for the cone skimmers if possible)
Id recommend using live rock (even if you buy some base rock and seed it) going this route will allow you to take full advantage of your tank size without having an overly excessive filtration system.
Lights- doesnt matter what you use if youre not doing corals ( if you are, look to t5ho or leds)
Sump- run macroalgae ( chaeto or caulerpa)