Okay, let's say I can put in 10-15 hours a week. As I said earlier, I don't want to make a living out of this. I want to make useful things, useful enough for a person to pay me to do it.

I don't have a revenue target in mind. If I get at least $25 per hour I spend, I'm more than happy. I have no idea what the market rates are though. I am handy with most technology, and have enough equipment at my disposal.

Yeah, that's do able. You need to find basically 1 client and hope they're pretty decent. Try services like toptal.com, grouptalent.com etc. The high end type ones are best: search HN for more of them. Tell them your time commitment.

Alternatively look on craigslist.

Make sure you have a good portfolio before you start looking: build some stuff to show off.

I'm also interested in this. I would invest 10-15 hours a week. Perhaps more if the pay was $15.00+