Your flip book should have at least 20 pages (the minimum to show movement of some sort.)

Here are some useful tips:

http://www.wikihow.com/Make-a-Flipbook

http://makezine.com/projects/photo-flipbook/

https://www.youtube.com/watch?v=iExiCGV7jzI

http://crafts.creativebug.com/make-flip-book-2001.html

http://www.instructables.com/id/how-to-make-a-flip-book/

http://howtomakeaflipbook.net/

http://animation-tutorials.wonderhowto.com/how-to/create-flipbook-animation-362986/

http://www.glitterfy.com/flipbook.php

http://chris.pirillo.com/how-to-create-a-photo-flipbook/

http://www.kodak.com/eknec/PageQuerier.jhtml?pq-path=10953&pq-locale=en