Look in the phone book for repo companies, call and ask for a interview with the owner.
Individuals cannot, in most states, do repos unless they are licensed and bonded by the state Government. They can only work for a company that is state authorized to recover assets, on behalf of the owner of those assets ,usually a bank or loan company.
Most states require an individual to have NO CRIMINAL RECORD, and post a cash bond, before they can be licensed under a company 's name, as their employee.
You also have to learn the laws in your state that govern repos and pass a state test on those laws. No pass, no license.