Ask HN: Resource to outsource the business side of starting a side project?

I've had a couple side project ideas (either turning one of my existing open source projects into a SAAS business, or starting a couple new ones). But I work full time. I'm looking for a company that I can outsource the customer handling (payments, refunds, possibly support triage), for a share of the income (even if that is a significant share).

Or would I be better off finding a business partner, where I'd handle the technical side? Basically I'm concerned about making sure I'm following applicable laws, liability, insurance (if needed), and this is even before I get to the point of validating that there is a market for the ideas.