How to set up a/c and heat

I bought a heat and AC kit off of eBay. I know those aren't the best but it was all I can afford at the time. (My cuda didn't have a heater/AC box)

I'm a little confused on how to wire it for heat, it came with 2 knobs, Temp (hi-low) and Air (1234). It did not come with a heat knob or anything. And it virtually came with no instructions. Has anybody used this kit before? And does anyone know how to select heat, and then select a/c.

They said it was for both heat and AC, I wrote the seller asking for instructions and I didn't quite understand what he said, something about a shut off valve? I will attach a photo of the message as well as some photos of the ac parts

IMG_5198.JPG

IMG_5199.JPG

IMG_5200.JPG

IMG_5201.JPG

IMG_5202.JPG

IMG_5203.JPG

IMG_5205.PNG