Congratulations on your interest in starting a vermiculture or vermicomposting business! It's certainly been rewarding for us!
This is a very complex topic, but if you are in the beginning stages of your business startup, we recommend checking out the Urban Worm Company Business Resource page. It has a list of both free and paid resources (including our own business course) you can use to learn what it takes to succeed selling worm castings, worms, worm bins, and more!