Separate your metals: Probably gonna be mostly steel, a magnet is definitely gonna be your friend. If there is metal that is still shiny, its probably stainless so that goes in a different pile, then you have Aluminum which is non magnetic and is probably going to be corroded from sitting. Any copper wiring goes as #2 insulated around here, should be similar where you are. I would search certain machines on here to see if anyone has done one and explains about them better, ex: bulldozer, loader, etc.