Rut Rider
Some info is just hard to get. I rode enduros "up north" (New England) years ago and our bikes had to be completely road legal, including a valid safety inspection sticker - a real hassle if you didn't have a friendly inspection station mechanic, required hi beam, lo beam, horn, mirror, blah, blah, blah.
Seems that down here, Florida and SETRA, the key is to "appear street legal". I might be wrong (I've only ridden one enduro down here-got the hare scrambles bug) but it seems that their official rule is "street legal" because they can't really advertise anything else. In reality nothing is really checked except for the spark arrestor. You need lights, head & tail, but I don't think they have to work.
According to the enduro guys in my club Brown Mountain Lights is a great run. You should have fun. Just remember that it's not a race, it's a timed endurance run. Pace yourself. Keep your eyes open and your brain in gear. If you see guys sitting around don't be thinking they are lazy and resting. If you're not up on time keeping, keep an eye on the guys/gals that pass you or that you pass. Their row number will give you a hint as to whether you should speed up or not.
I think the purpose of the resets are twofold; 1) To give riders a chance to gas up and catch their breath, 2) To give riders a chance to get back on schedule without being crazy on roads and fast sections. The locals don't like seeing bikes going up their dirt roads at 80 mph. Basically you "reset" your odometer to the mileage indicated, calculate (I'm assuming you don't have one of those fancy onboard computers) if you are late or early based on the new mileage and then wait a while or get going.
Don't stress-you'll have a blast!