For a wet kit at 100 hp or less you most likely will not need any major supporting mods.You will need one-step colder plugs at the very least. If yours is a standard I would highly suggest a window switch. This will shut off the spray at a high rpm in case you miss a shift. The nozzle should supply ample fuel even without a fuel pump upgrade. I would go with the NX kit and start off with the 100shot nozzle. Each kit comes with different nozzles for 75, 100, 125, and NX comes with a 150 although I personally wouldnt go that high. Ive seen too many popped intakes with that kind of shot. IMHO I dont think you need a direct port system with such a low shot. Anything below 125 and you most likely will not puddle. After you get the kit installed you need to get it dynoed just to be safe. The reason for this is you want to ensure that you are indeed getting enough fuel. I have never seen a wet kit under 125 go lean on a healthy car but better safe than sorry.
Read the manual carefully. Especially the part about not attempting to start the car after a stall during which the nitrous is engaged. In this scenario you are likely to have fuel and nitrous in the intake and when you turn it over ...... BOOM!!!
Also do a search on this forum with the keyword "nitrous". You really need to educate yourself before you go with nitrous. However if you know what your doing and you dont screw up it can be as safe as any other power adder. Oh and in my eyes it is the most fun. Nothing beats the kick in butt instant TRQ that nitrous gives you.
I hope I remembered everything. Im sure someone will step in for me if I didnt.