The paper weight is usually called out on most kits. There are 3 main weights: 20lb bond paper, 65lb stock and 120lb card stock. I mostly use 65lb stock for most of the kits and 20lb paper (regular printer paper) for the small, fiddly bits. Paul mentioned Aileen's tacky glue. That is good stuff, but I do normally use Elmer's, spread really thin with a straightened paper clip as an applicator/spreader. It should look like you licked the paper and not smeared it on too thick.