Hermetic compressors come with all the oil you need. Additionally, the refrigerant has oil in it as well. Sweat your connections, evacuate the system with your vacuum pump (I doubt you know sweep charge procedures), and add the required amount of refrigerant. Always replace the old drier with one that comes with the compressor. To answer your question about where to place the new drier, unsolder the old one and put the new one in its place. Since the new drier has a Schrader valve, it is best to remove the valve stem before soldering or at least use a wet rag on the drier to prevent overheating during the install process.
Evacuation Techniques