I second RKnight's suggestion, get the video.
I have a book ("The Balisong Manual" by Jefff Imada) and the video by Michael Janich. The book is interesting to read but, it's got alot of extra info (like the history of the knife, ways to carry, ...) besides showing "tricks". The book is worth getting but, get the video first. The video is pure "tricks", alot of things you would never think of.
One note: when I had ordered the video from Paladin Press, they told me it was $30 not $20. I told them the ad that I saw definitely said $20. They said OK and gave it to me for the $20. I assume they advertise different prices for this video and try to get the higher price for it.
Be warned, you'll probably end up needing/getting another balisong for practice.