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.
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