It probably goes without saying, but check all the fluids including antifreeze and flush out the radiator so the car doesn't overheat. If the car has power steering, I'd replace the power steering fluid. If your replacing the brakes you will of course have new fluid, but if you don't, replace the brake fluid, as it retains moisture. I'd also drain the gas tank and fill up with new gas. The new gas will take a toll on rubber hoses, so I would inspect those and replace any that are questionable. Same with vacumn hoses, inspect and replace. Also inspect the tires. Hopefully, it wasn't sitting on the tires for all those years.
You can't cure stupid