I ended up teaching puppy classes for five years and getting my certification with NADOI (N'tl Assoc of Dog Obed Inst.) when I took my dog to obedience classes. I got to know the people who taught the classes and volunteered my services. After volunteering for one session of puppy training classes, it was clear that I had found my niche! We lost our building, or I'd still be training. When checking out training facilities in your area, make sure that your training philosophy "gels" with theirs.
Good luck! It's so much fun--I miss it!