You need to flush the system with a good AC flush fluid and purge all of that flush fluid with a lot of dry compressed air (or better yet, nitrogen). Failing compressors will fill the system with fine debris for a long time before they seize, and you need to get that out.

I would recommend replacing the condenser, as these are very hard to flush and even harder to purge. Also replace the expansion valve, which must be removed to flush the evaporator anyway.

I would certainly get a shop to recover the existing refrigerant. However, once you uncap the new dryer, you need to add oil, connect it and immediately vacuum the system. I would be hesitant to connect it and then drive to a shop for evacuation.