Hi. Google a master dog trainer who is registered to train service dogs. Depending on your needs and the dog’s ability, training can take as little as 6 months. Best of luck

@cindy24 Here are a couple organizations for service dogs. I'm sure there are others too.

Assistance Dogs International
https://assistancedogsinternational.org/main/looking-for-an-assistance-dog/
Canine Companions for Independence
https://canine.org/
I knew a woman who ran a regional office for Canine Companions and I was involved in their fundraising. I would see demos she did with her dog to show people how much the dogs can do. I know some of the criteria is to be able to use your arms to handle the leash. The dogs are really amazing!