If you've had a hole in your condenser, then all the refrigerant is already gone. You will want to flush each component (Condenser, Evaporator Core, Compressor, and all lines not attached to the receiver/drier) before replacing your receiver/drier. Also, its a good idea to pick up an assortment of A/C o-rings from the local parts store and replace them all. Once that is done, you will need to have the system placed under vacuum, which will do a couple of things:
1- Checks for any other leaks
2- Helps pull any junk, left over flush or moisture out of the system
At that point your system is ready for a new oil and refrigerant charge.
His: '00 WJ 4.7 Limited- Zone 4" SA lift, JKS BPE's
Hers: '03 WJ 4.7 Laredo- IRO 3", 245/75/16 Duratracs, Bilstein Shocks, JKS TB w/KOR Bushings, Rusty's A-Arm Spacer, CORE4x4 Adjustable Front Control Arms, Dynomax Exhaust, RB1 Nav -Coming Soon- Overland Rock Rails