1st time restoration, need advise

[looney]

Just bought my son a 1971 GMC so he and I can restore. Any advise on where to start, find parts, what to look for etc. truck has good motor and tranny. Bed rough, but I can live with the rest. I also found another I can buy that has been sitting in a barn for 30 years no rust solid and straight. Motor is locked maybe easy to free. I can get it for a grand. Is that a fair price. I could sell parts from the one that's running ( fenders doors hood ) but can I get my grand back.
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