You might be better served doing a google search for this. I think you're looking to be a hosting provider, right?

If you don't know where to start with the search, I'd try keywords like: virtualmin, cpanel, hosting provider setup, etc. Honestly, I'm not even sure if TKL would be a good place to start.

I'm sure if someone else sees this and has experience setting up a system to be a hostng provider, they'll speak up.