All the best.
There are new parts available but not all and are quite expensive now. Some repo parts aren't great and even Volvo parts will need adjusting to fit. Good used parts are out there but also expensive. Build quality wasn't that great from new and the car is welded together so not the easiest car to do. Fully strip the car and you'll find the rust areas, if not much rust you have scored a good one!
You can get documentation online here:
http://volvo1800pictures.com/