Oh, I meant no offense or for you to "use the search function". I posed the question maybe 7 or 8 years ago, not even sure if it was on this forum or the origami mailing list.
I have not had much luck purchasing items from the NOA (it wasn't their fault, apparently japanese banks and internet shops have issues with debit cards and free internet based e-mail addresses), so I didn't pursue the certification.
Personally, if you want to teach origami, its best to learn from teachers. I learned alot from conventions by attending classes and watching the way the teachers taught models, but experience helps too. You could also watch Adams Sara
http://www.youtube.com/user/AdamsSara , especially the way she teaches the bases and various moves.
Most people you teach that aren't already origami artists won't bother learning the terminology, so its best to use descriptive terms (such as fold behind instead of mountain fold). Its also good to think simple, moves such as petal folds or even reverse folds can cause snags in a class. One of the hardest things I've found in teaching, is when someone gets left behind or lost. You can either stop and help them, or continue without them and help after class (in conventions, the second option is more likely). There used to be a teaching tips section on the OUSA website, but I can't seem to find it. The old page is available at:
http://web.archive.org/web/200702111329 ... g_tips.htm
Overall, the choice of model can be the most crucial for class interest and sucess. Action models such as the American Jumping Frog, or fun to fold models such as Sarah Wooden's Candy Cane, or classics such as the Yoshizawa Butterfly or my favorite, Robert Lang's Duck have been some of the most popular models I have taught, and with the least snags. The more people enjoy the class, the more likely you'll be invited back. Though, if you want to use non-traditional models and you're getting paid, its best to ask permission from the author.