I am just learning After effects but it seems that shooting video with acurate lighting to show all detail through the turning of the pages may well be a good start, as far as the book and page realism goes. Watch your shadows. You need some direction of light on the book to have it appear 3 dimensional. Then let the power of after effects create your pape content so it is ledgable through out the turn of the page. You may need to rotoscope during each frame.
Using camera and light will help page content to appear realistic as to the video of the books page turning shadows. Further intriging animation could be done by parenting page content with a null object. I have only been studying AE about 6 days so I hope one of the resident guru’s will be inspired to help you from here. Since I am so inexperienced it will be interesting to see exactly how far off base I am with this solution. Anyway, my suggestions will probably be quite time consuming but it could also be the most realistic way to accomplish your task.