It is a daunting task of where to start and where to stop. In the old days I bought a Thule or Yakima rack, a small basket and called it good. For suspension on my Blazer I left it stock, added a K&N filter, put on a winch, and a pair of bumper mounted driving lights. Cibie I think was the brand of the lights. I bought it with posi-traction and 4:10 gears. It was used mostly for bird hunting in the three or four States and an occasional trip to the mountains in Colorado, where we lived at the time.
If I was doing an off roader today the only thing I would add is those LED lights and the roof rack and basket, maybe a skid pan or two, and a set of tires like the BFG KO series. Always had good luck with those tires. Good luck with your "project".