The animation for this is relatively straight forward, it's making a realistic book that is the hard part of creating this project.
Create solids for the pages and covers, offseting them in Z-space, to make a 3d feel. Adjust the anchor point of your cover(your cover might be 20 to 30 solids, or a 3d rectangle) to the spine of the book and then open it up by animating the y rotation of your cover.
AE Tuts has a very long tutorial on doing this for a popup book:
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.