Welcome.
A) Hit the rules page...it is like 6 pages of rules and not hard to digest. There you will find "no compressed gasses" so not NOX.
B) First race(s) are not about max performance, they are about survival. All that stuff you want to add, does not increase reliability or safety except potentially the brake upgrade. Ignore the BS laps because you will suck as a team that first race anyway...safe (pass tech), reliable, then add reliability.
C) Creating and keeping a team together all the way until they get some track time and are hooked is harder than anything involved with prepping a car.
Best newbie car has bee covered many time right here in the this topic. You have a few choices but they fall into three categories:
1) What do you already know well or a team member DD's
2) What is proven reliable IN Lemons, has high PnP availability and is still not terrible to race
3) Buy an already prep'ed and race prove car that another team is bored with
The first one can literally anything. The second is somewhat regional but kind of goes: Escort (mazda BP motor only)/Mazda Protege, Focus, Neon, Volvo 240, GM W-body (pretty terrible to race but fun in its own way), small pickups (if your cage builder understands the requirements) and a litany of small Honda and Toyota commuter cars.
Buying a prep'ed car has many advantages if your primary interest is not the actual build. You will save money. It likely will pass tech. Most of them come with spares. The build time for race one is measured in tens of hours instead of hundreds. All of these also conspire to keep your "We are so in" group of buddy still in it to green flag for a couple of reasons. First is a big chunk of the prep cost are upfront...those without the finances to do this fall out right there. Your pre-race prep is more relaxed and fun with a focus on all the little things and none of the big ones. You should have time to have fun with the theme.
Keep in mind a running average for getting to the first race (less personal safety gear, tow vehicle, trailer) ranges from $3500-6000 for most teams and if you build from scratch is a minimum of a couple of hundred manhours.