Starting a manual assembly line

Hello people,

So i have this idea of starting my own manual assembly line. I have extensive experience within manufacturing industry as i have worked as a manufacturing process engineer for 5 years. What i don't have is the skills to start a business. Lets say i have an assembly line set-up in a rented workshop, i have labor-cost calculations, manufacturing overhead calculations etc, where would i start searching for potential clients who might need to assemble something?

Thanks in advance :)