Then it's time to start looking for a training program. There are several lists of service dog providers on the internet. That's a good place to start, but remember that just because they appear on one of these lists doesn't mean they are qualified or even legitimate. It is still up to you, as the consumer, to do your research and make sure they are what they appear to be.
Assistance Dogs International
Certification Council for Pet Dog Trainers
National Association of Dog Obedience Instructors
Karen Pryor Academy
The Delta Society
Association of Pet Dog Trainers
American Dog Trainers Network
Wolfpacks
Please note that the above organizations do not screen the programs that they list. You'll have to do that for yourself. I am aware of rip-off organizations in the database, so be careful.
You can screen a potential trainer or program by:
1. Asking them lots of questions.
2. Observing their classes/training sessions. Do you like their methods? Do the dogs like the methods?
3. Observing one or more working teams they've trained. Do the handler and dog know what they are doing? Is the dog consistent and reliable? Is the dog calm and workmanlike? Does the dog perform recognizable tasks?
4. Visiting their facilities to see if the dogs appear healthy, happy, and well cared for. Facilities should be clean and in good repair.
5. Interviewing past clients. Are they satisfied with the services they received? Is their experience in line with what you are looking for in a trainer/program?