I think you'll need to do a bit more research if you want this to be an authentic book. Deckle edges for example are just a byproduct of paper production, not a sign of quality or age. Easily trimmed off, and in a bound codex, usually undesirable. Books were meant to last.
Late medieval paper certainly existed, but wasn't used much for important things (and if it's a bound volume it's important) The process of pulping softwood is pretty nasty, and not period. Bast fibre (linen/hemp) and
maybe cotton (depending on where you are simulating) would be more a ppropriate. Een today a lot of the "paper" that we think of as being wood fibre based actually isn't (your money for example)
Lots of good sites though! Check out a few...
http://www.ceu.hu/medstud/manual/MMM/paper.htmlAnd
THESE guys seem to be doing a good job!
http://www.saintjohnsbible.org/That is the type of manuscript I would love to devote a year or so to writing. Illuminated, gilded, real vellum... ooooooo....
Matthias