Hello , first of all sorry for my poor english , secondlt go buy a book like this one , with hard covers.
Step 1: Step One
Pick like 20 pages from the front and 20 from the back , this pages will not cut down.
Step 2: Step Two
Measure how much big you want to cut the pages and stick with the same numbers , to all pages.
Step 3: Step Three
Use something sharp like this tools to cut the pages.
Step 4: Step Four
When you cut all the pages , it will look something like this , now use some paper clue and clue the inside of the pages , and little from the outside.
Step 5: Step Five
Let the clue dry , now the pages are all together and cant be seperated from each other
Step 6: Final
Now you can hide anything you like inside , put it in some bookself or anywhere you want ;)