Time is key. Don't rush, as your tank will show it and you will have a better understanding.
Lights-Lighting all turns around what you would like to put in your tank, such as corals. Better the light, the more diff type of corals you can have. This is how I would class some of the diff lights.
2 bulb HO
4 bulb HO
6 bulb HO
T5 or MH
150w/ 250w anywere from tank depth. The 250w I would say prob a 90Gal or taller.
'S- depending on the brand and how good the LED
Sump- Bigger downstairs, is better. Allowing you to use the full amount of space you got.--For example on my 75Gal tank I got a 33Long sump with a wet/dry filter, refug, and a Hydor skimmer. As filter goes, it all depends what your personal idea is.
In the end work around what you want, and good luck!!