Bullseye has a video lesson (this one is available only with online subscription – $39 per year, and worth every penny!!!!) on powder printing. It is well done and complete. There is also an excellent video lesson on screenprinting at Bullseye.
I got a lot of help by watching 2 DVDs by Tony Glander – they are excellent, and they can be rented if you don’t want to buy them – forgot the name of the online craft DVD rental place – sorry.