I bought a new A/C compressor and I heard that it needs to first be injected with oil?

I bought a new A/C compressor and I heard that it needs to first be injected with oil then you can add the Freon. Can you please tell me where it goes? The oil and the freon? I bought the hose to connect, but the auto parts person said that you need to add it to the low side not the pressure side. I don't know where that is located. The hose nozzle does not fit the top side under the hood and I don't know where the other side is located. Please help!

Thank you very much!