NESBA isn't a racing organization, so they don't issue licenses of any kind.
there are 2 classes of racers: "novice" (yellow plates) and "expert" (white plates). the only reason you would 'need' a race license would be to register for "A" group on your first day. and it must be an EXPERT license. a novice license is not sufficient proof of "A" pace.
you can get a race license through the various racing organizations. WERA and CCS are the most popular (at least in the midwest). they'll usually run a race school friday or saturday, evaluate you during a mock race, and then give you a provisional license for Sunday. You survive 2 races with an orange shirt (so the other riders know you're new), and you're a fully licensed novice racer.
an EXPERT license can be obtained a few different ways:
- you win a novice championship
- you petition for an expert license, and are granted one by the racing org (if you're consistently beating the novice field by 30 seconds the first 3 races, they'll probably grant you an expert license - ask Hix)
- other novice racers petition for you to be moved into the expert class (again, if you're beating everyone by 30 seconds...)
At least that's how I understand it. I've not raced. When my life insurance company called and asked me if i "race, or plan to race motorcycles in the next 12 months," I truthfully said, "no, i do not hold a competition race license."