Just bought a 64 long box

[ljackson]

Hi, I bought a '64 long box last week that my 14 year old son and I are going to restore. I have a few questions. First, the fresh air and heater blower controls. Our pickup has the fresh air cable, although it needs to be replaced. There is a second hole in the dash panel. Is that where the blower control cable goes? Do you pull the cable for high, med and low?
Second, to fix sagging doors can you replace the hinge pins and the whole hinge?
Third, there are several vendors that sell parts listed on the forum. Do you have any favorites for parts for a pickup like mine?
And last (this post) after reading stuff on this forum I think there is an inner and outer rocker. The (top) outer is rusted through where it meets the floor. Should I assume the inner needs replacing if the outer does?
Thanks for your help,
Eugene