I'm sure Ken Hamedy would be able to tell you alot more than I could, but here's what i've gathered:
To receive certification from Crystal Decisions, you have to become an ACE: Accredited Crystal Engineer/Authorized Crystal Engineer...something Crystal Engineer anyways. The course costs about $2000 Canadian (so alot less for Americans), and is done via the net from my understanding.
Thats where I'd start looking anyway. Not sure if htey have advanced courses if you want to become an instructor or not. Again, checking with Ken would be your best bet.
Laterz,
Jack