It depends on what type of wheeling/overlanding that you want to do but here are my suggestions.
My thought process in putting together this list is to get done quick and cheap so you can get out there and enjoy it while you figure out (1) if you want to continue doing it, and (2) figure eout what other upgrades you actually need or want.
-Maintenance #1. If you break down out there, the rest of the stuff is worthless.
-HAM license class (and buy a HAM radio, handheld is fine and allows you to hike out if needed)
-Stock rims to save money and 235/75 R15 tires
-ZJ Drag link
-Front and rear tow points (Rear hitch works) (if you wheel alone, bumper and winch suggested)
-Recovery kit (Shackles, straps without metal ends, tree saver, gloves, etc)
-Roof Mounted Cargo box for all the lighter stuff (clothes etc), Keep the heavy stuff in the “trunk” to keep it low (Spare parts, tools, cooking stuff, food, etc)
-Junkyard S-10 bastard leaf pack to help with the sag of all the weight
-Budget boost 1”-2” spacers for up front to level the rig
-Jeepcables battery cable upgrade
-K-Suspension (or DIY) E-fan switch override
-Putco Headlight harness
-Amazon LED Trucklight lookalikes ($100)
-Raybestos Brake pads
-Gojeep gas tank mod
http://gojeep.willyshotrod.com/HowtoFuelTank.htm
or ZJ Gas tank (or combo and get 25gallons)
https://www.naxja.org/forum/showthread.php?t=1131307
If you plan to do more rocky trails, skidplates for t-case and gas tank are suggested; stock would even work. I would also advise sliders of some sort, JCR are a bit pricy for everything they sell.
If you do an LED Bar, don’t put it on the roof. Bumper mount is much better. Roof has a ton of wind noise on the road and it reflects off the hood and blinds you.