What tools I should bring? (Whatever you think you might need, definitely flat-fixing stuff, the rest is optional at your discretion)
Do people generally need spare spokes? (Not often, some people will carry the fiberflex spokes. My Sojourn came with spare spokes on the frame, but it'd take a chain whip and other tools to put one on the back. If you've been breaking spokes, carry spares, but preferably get wheels where you don't break spokes in the first place.)
How many spare tubes should I have? (That's entirely in your judgment. I carry one or two tubes + a patch kit. I've carried a spare tire on a few rides, but not often.)
What type of equipment is allowed? ( Fenders, bike racks, panniers, tri launchers, aero bars ect. ) (All of that stuff is allowed. Your bike has to be human-propelled, should have a chain, otherwise, it's pretty open. Recumbents, time-trial bikes, fairings/ HPV's, 3-wheelers, tandems, triple-tandems, etc. are okay. PBP in France doesn't allow aerobars, but they're okay on US rides, may or may not be prudent.)
Is there any route information available / what is the groups website? (Go to www.rusa.org, find the link for local rando clubs there. See his comments about the cue sheet being available ahead of time above. Also, find the rules there.)