What most naturally follows?

How to start a car insurance company
Obtain a property and casualty insurance license from your state.
This license allows you to legally sell car insurance in the state in which you hope to operate your business, and ensures that you have the necessary knowledge and skills to do so.
Attend a pre-licensing course.
You will likely be required to takes courses covering both insurance and ethics. These courses will be specific to the state in which you are hoping to acquire a license.