Might be easier to buy a new Jeep, the bad news is you have a 2002, completely different...
Plan on dismantling your Jeep; pull the radiator, remove the front half of the interior and the complete dash, half the engine compartment.
You'll need the base components; compressor, condenser, TEV, accumulator and all the attachments and hoses along with wiring harnesses, controls and a whole lot more
An alternative, and maybe easier and cheaper in the long run might be an aftermarket kit, JeepAir.com sells a complete '02 TJ kit, about $1100 JeepAir TJ A/C Kit
<Click there and scroll down the page, there's two kits for the '02, one for the angry squirrels engine and one for the 4.0, not sure which you have.
We shall now flame you for not being hardcore
A/C, what a wuss
And no, those are not A/C controls on my dash, shhhhhh