fetish, I'm gonna jump in as a newbie wheeler (lowtide can vouch for that)--here's what I learned my first time out (GSMTR a month ago). This goes for Tellico gnarly boulder trails--in Florida YMMV:
spare carrier on rear bumper looks cool, but doesn't matter--when you're going to wheel trails drop the spare (when you get one) and throw it in the back.....spend your money elsewhere.....
if your truck's cherry, body armor is everything--the rocks in the smokies can beat the hell out of nice straight sheet metal...not as big a deal in the sands of fla.....for rocky trails get sliders and rear qtr armor....
rear locker helps a lot, lockers front and rear rocks, but I'm staying away from anything but on demand in the front...have to save up for ARBs. I WILL have detroit, aussie or no-slip in rear before GSMTR 15.
The other thing I was missing is driving know how--there is no way to buy that. My truck would make these horible grinding, scraping noises, I'd feel like I was flipping the truck over, and my spotting buddy would say "you're cool, that's perfect!" you will scrape and grind across rocks that make noises like your truck is coming apart. that freaked me at first, but it's no big deal--take a good luck under your rig and you'll find a lot of beefy, heavy duty metal. You'll be blown away at what these things can do, even with little modification.
Waaay too long, sorry. Get your spare, get a hilift, and get out there. Earn some bruises and dents, and you'll have a much better idea of what you need next. (Not meaning to preach--I'm talking to myself too.) Cruise on!