1)Upgraded Fuel Pump
2)Most Likely Upgraded Injectors
3)Colder Heat Range non projected tip plugs
4)some way to pull timing
5)Plate, Nozzle, Direct Port(fogger), or spray bar. Also plenum systems, but I doubt you have a sheetmetal intake manifold.
6)10 or 15lb bottle with a mount and -4an nitrous feed line at the least.
7)Window switch that uses either a microswitch's input for wot or one that uses TPS signal for WOT,
9)etc. etc. etc.
There are so many different brands and styles of nitrous that it can get confusing for a first timer.
If I were you I would call Nitro Dave@Nitrous Outlet and tell him what you want out of your car, what you plan to do with it and how often the nitrous will be used. Dave, Neal, Graham or any one of those guys will go out of their way to make sure you get what you need. Even if what you buy wasn't purchased from them, their customer service is second to no one,
I would personally go wet, it's the easiest to adjust fueling wise with fuel jets and fuel pressure for the nitrous system without needing a computer or tuning program to change the fueling.
Dry is IMO better than wet, but only if you have the right system and set-up to utilize it like per say Justin Smith, ATVracers old set-up, Brian Black and more.