i'm not an expert on this, but i don't think there is an association that gives licenses to be a guide. i don't even think there exists a guiding license. if you want to guide, you probly just have to contact lodges and apply for a guiding position. Lots of ppl guide independantly too, it would be tougher to get into that, because you probly have to establish a reputation before you start getting lots of clients. anyways, like i said, i'm no expert, but i've never heard of a guiding license.
Howard