A person doesn't have to take classes to do this. I'm an ex-con, and I am on my second startup since my release. My first one failed due to being in too-small of a geographic market for the service.
My current one is now 30 months old and is growing. We have myself and one other full-time employee and two part-time employees. It is a factory business and I am looking to build it to about 40 full-time employees.