you could start by being more specific ^^ what is a timeline/progressbar for a book? you mean a "your are here" kind of thing? how did you create the flipbook? it's hard to give you answers without more input..
the book , that i've created is actually an induction booklet for company staff. now, i want them to know as they progress with the book, how much induction process they have completed. the link that i've posted above is the same book that i've created. i haven't added anything yet in those pages.
You can use kvisoft flip book builder. It allows people to add timeline and progress bar on flip page.
Have you looked at the 'progress' element?
http://html5doctor.com/the-progress-element/