What is intended use for it? Park it somewhere or tow it? First is to verify frame and axles are serviceable. If you are going to tow it then replace all the brakes. Id just do new backer plates and all. Then bearing inspection and repack if the bearings are any good. Lastly wiring.
I drug home a 68 Monitor that had sat for years and lucked out with the wiring and even the brakes.Bearings were bone dry though but serviceable. So there is hope. After a few months work we camped in it and towed it thousands of miles.