The best resource is probably
The Encyclopedia of Playing Card Flourishes http://www.flourishman.com/
I also suggest registering & perusing the forums at both the Buck's site & Handlordz (see links above.)
The Buck's forums has some video and links to other sites with tutorials (check out Kevin's stuff.)
The "challenge forums" on the Handlordz site is interesting... Flourish guyz challenge each other via internet videos... watch and learn.