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The first thing you need to get for this car is a factory Chassis Service Manual. They are all over ebay. Get an original paper copy. Repros and electronic versions are all based on scans of paper originals and often loose something in the translation.
I agree with Joe an assembly manual helps also. Best money you will spend and a resource you will use over and over.
There are three manuals that will be helpful. The Chassis Service Manual is the highest priority, as it contains all the information needed to properly maintain and repair the car. The Fisher Body Manual is the second priority. It contains all the info on the body-related items such as doors, windows, and interior. The Assembly Manual is really just reprints of the factory engineering drawings and specs used to assemble the car. Frankly, I'd rate it a distant third in terms of priority for someone looking for maintenance information. The Assembly Manual is mandatory for a proper factory restoration, but less important and less useful for just performing maintenance work.