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Your best bet is to media blast the car since there is rust on it. It also gets anything that could be cratered up in there out. After that If there are no patch panels that need to be made, the next thing to do would to be put the whole vehicle in etching primer to prevent rust.Next, thing to do is lay a skim coat of filler over the whole vehicle, then sand it. Any low spots (or high for that matter) will be found when you use a long block sander over the whole car. The spots that go back to metal will either be the right height, or maybe they are dinged out for any reason, you just have to judge it. Anything low you will need to keep going over until its smooth with the filler, (you dont want to be doing much more than a skim coat of filler here) if you go more than that you will have problems, and you should really fix it the correct way with a body hammer, and a block. After that, you would want to look into a good primer, and eventually a good paint and clear. Visit your local body shops, see what they use, and try to find a local automotive paint distributor to find their better paints (if you cant find any, I will talk to my dad and see what he paints primers, and clears we have been using). Talk to those guys and they usually can point you in the right directions as to using paint. As for painting cars in barns (even though you have a booth accessible) I know someone who does it all the time, and all of his cars have been class winners at not only Super Chevy, but other large shows the cars have been to. And no there is no spray booth in his barn.
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