advertise about it and see what happens
You can find a detailed on starting a Dog Obedience business on aboutdogfacts.com/how-to-start-a-dog-training-business/
One way to make money by starting a business involving dogs is to offer services such as dog walking, pet sitting, grooming, or training. You can also consider selling dog-related products like treats, toys, or accessories. Another option is to start a dog breeding or daycare business. Research the market, create a business plan, and provide excellent service to attract customers and generate income.
you have to be 8 or 9 to start a dog walking business.
paper training or sandbox training
When your dog is still a puppy.
The dog is supposed to do its business a specially designated place around your home. This is achieved by training it.
One thing you could do is you can start a dog walking business around your block.
I would Recommend to start a dog walking business at the age 12 plus, if your able to walk dog's with parents or guardians approval.
Probably when your dog is a puppy or when your dog is a adult i suppose.
You need to show that you have the abilities, experience and authority to help them. But make sure that you have a non-minor person that will help you with the paperwork and establishing your business.
A good book on dog training is a great start. After that it's a matter of time and patience. The more time you put into your dog training the better the results will be.
i think it is the age of 4 months to start training but not guarding training you will find how to train and the best time for training in this blog http://yourdogtraner.blogspot.com/