It really depends on what you want ot do with it. The very first things you should do are recovery points. Two tow hooks on the front bumper and either a hook or hitch in the rear along with a good strap with looped ends. Second would be a CB radio for trail runs. On a TJ bioth these mods should run under $150 Wheel it a few times to make sure you want to keep going because it will become a money pit.
For around here a decent setup would be 3" or 3.5" lift, 33" M/T's, front bumper(ARB etc...), 8-9.5k winch, skid plates and sliders.