The pic of the compressor label says R-12, so hopefully this is correct. The first step is to turn on the AC with the engine running and visually see if the compressor clutch has engaged. If not the likely cause is electical (fuse, etc.) or a faulty compressor clutch, or low on freon. AC works involves the use of specialized tools and equipment plus appropriate safety procedures. You might be money and time ahead to take the car to an AC specialist for diagnosis.