Opoinions as to order of importance obviously vary with personal preference, application, driving style, terrain most driven, etc.....
But I will throw mine in anyway. :stir:
If I was to start new into wheeling, time warp back 20 or so years, and would have my future self give advice......
And assuming for this discussion I would have a full size pickup, and that recovery gear like a Hi-Lift, tow strap, chain, hand winch, shovel, first aid kit, extenguisher, etc... are already available, (this should almost be standard equipment for any car :lmao

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1 - Tires, trim fenders to fit 35's, or 33's should just fitput up with rubbing, loss of power and poor articulation for a while
2 - tow points, may as well make bumpers at this point, plan for your winch now.
3 - Gears and lockers, this should be a package deal.
4 - Suspension Lift. Body lift only if you need to clear drive train parts.
At this point you have a solid rig.
5 - Winch & bigger/dual batteries. Go big. For a fullsize 12,000lbs and 2 x Group 31 batteries..
6 - Drive train. I like standards so would already have a "bull-low" first gear. Lower T-case gears if available and/or dual T-cases (doubler).
7 - Engine upgrades.....more power breaks stuff easier. Having Had over and under powered rigs, I am really undecided on this.

8 - Skid plates
9 - Body armor, roll over protection
10 - CB, GPS, Stereo, Gauges, etc.... are nice, but not essential, put them on your birthday/X-mas list and install when you get them.
8 & 9 are late on purpose. Hearing things smash into rocks and being afraid to roll, should have made you a better driver by that point.
There ya go, my opinion, for a beginner to build a solid truck to build and grow with. Of course once you are done, you'll realize that you want something completely different than what you build, as your off road experience grows ..... good time to pick up another project projet ... :flipoff: