A/C help please!

[Low Elco]

I know NOTHING about AC stuff. AT ALL. Got an 87 SWB C-10 with factory ac that I got with none of the engine related A/c stuff. I've bought a receiver, orifice tube, compressor, compressor hoses. I yarded all the compressor brackets. Turned out the condensor was broken, so I got one of those. It's a completely different design optimized for 134, and had some fitment issues, which are apparently a common complaint. I got that in, got the brackets on the compressor, and saw a sticker that says the compressor is pre oiled and that I need to put "x" ounces of oil in. What oil? You're supposed to scan the QR code on the sticker to find out, but that just takes you to a chart of all makes and models where I think they're saying they put mineral oil in. Now, If I'm right, you can't have mineral oil in a 134 system, and you can't get 12. So now what do I do? Also I just saw a video where I guess there's a high side switch in the compressor? I don't have that or any wiring for it. Where does the orifice tube go? Anyway, If anyone can help, let me know. I've been wrenching for a long time, but I know nothing about this.

Thanks, Chip