As an experienced BMW club member myself (with ~100 track events, including ~30 as an instructor), I respect the ability and experience of their instructors but they are rarely familiar with the NSX and often give inappropriate advice.
First of all, I would do very little if anything to your car to mod it for the track, for several reasons: (1) you should get accustomed to driving it as is and then figure out what, if anything, needs to be improved; (2) if you've never been on the track before (you didn't say whether you've been on the track in other cars), you won't be using anywhere near the car's capabilities, so you'll really be easy on the car; and (3) the car is really very, very good as it comes from the factory, and you can take it right out on the track without doing ANYTHING.
The ONLY thing I would do is to flush the brakes with fresh fluid before you go out there, and yes as long as you're doing this, you may as well go for a high-performance fluid like Motul 600 or ATE Super Blue or Castrol SRF.
I think bleeding the brakes before and after every event is probably unnecessary (I just make sure my fluid has been flushed within the previous 6-8 months).
If you have plenty of pad material left on your brake pads, just leave them and use them; the stock pads are pretty darn good. (I'm assuming you've got the OEM NSX pads and you didn't get say cheapo pads from the corner auto parts store, which are not comparable.) What you might want to do is pick up a set of RM Racing's street/track pads and bring them with you as a spare, in case you use up your brake pads, which is generally recommended when you go to the track. (I get 3-4 track events in front, 4-5 events in the rear, so you can use that as a guide.) If you don't use them at the track, you can put them on the next time you change them on your car.
Note that brake fluid and brake pads are really not mods because you're going to be changing them regularly anyway. They're "consumables".
If and when you run into any problems with your brakes overheating (with symptoms of either fade or of shudder), ONLY THEN would I worry about doing brake ducts, and not until then. (I have ducts on my car but don't have photos handy, will try to get some at some point this spring.)
Forget the track tires; unless you have tons of track experience, you'll never get into their capabilities. Last year I did my first track event on track tires. Yes, they made a difference. But I can tell you that they would not have made a difference in the first 20 or 30 track events I drove.
It's also worth noting that at NSXPO 2000, where there were 65 NSX's on the track, I was on street tires and was one of the four fastest cars in the most experienced of the three run groups, and was passing other cars that had track tires and superchargers.
HTH
