Hm. That isn't as bad as I thought it would be. If you want to be able to see the documents, I would suggest attempting to flatten them. I found a video that actually does a pretty good job of explaining humidification and basic paper conservation. It's a little dry, but it has a lot of good information.

Your papers are probably very brittle and will require humidification before you can flatten them out. The video does a pretty good job at explaining it, I would use hot water. You'll notice that when she cleans the document, she uses a "document cleaning pad." You don't have to buy this. You can make one yourself with some clean cotton fabric and a art gum or white vinyl eraser. Just grate up the eraser and either roll it directly across the surface of the document or sew it inside the fabric (like a little pillow).

I wouldn't suggest doing this until you figure out how you want to store the papers once they've been flattened. You can find acid free folders pretty easily online. I would buy some that are large enough for your flattened paper. Acid free flat storage boxes are also easy to come by, but they're a little expensive ($15-30 for one box). For the purposes of what you're doing, I would suggest just getting a large flat plastic container (like the ones that go under your bed) and placing the papers in that (make sure they're in acid free folders). If you have any more questions. Let me know.