Glad to hear you are having a blast with the Wave. I love the boat for its simplicity.., heh? and then I go and add a Hooter. Go Figure!
The best book for overall cat sailing is "Catamaran Racing: For the 90s"
As for the videos "Total Boat Handling" is the video that covers almost everything a little bit. If you were to disect sailing into parts, the other four videos concentrate on those factions of sailing/racing and are much more specialized and intense.
So, for starters the TBH video would be the best.
Good luck,
Rick