12 hours/week doesn't sound like enough time to make any money via appstore to me, as some are suggesting. It's just enough time to freelance a bit though! You can find part time freelance work without an established network pretty easily actually. I've done this successfully for web dev work several times:

1) search angellist jobs section for companies looking to hire their first iOS dev, or to have an MVP of their app made 2) contact all of them (this is a numbers game) by pitching yourself and how you have the exact skill set they need, include a portfolio, and mention your terms up front (hours per week/desired rate/no I don't work for sweat equity)

Even people looking to hire full timers are probably desperate enough to consider taking on a part timer, even as a temporary stop gap.

I prefer angellist jobs section to traditional freelance sites because you can avoid race to bottom bidding and avoid much of the competition. There are a lot of open minded people looking for high quality workers out there and are thus willing to pay a better hourly rate, but they avoid most freelancing sites and focus on full time because they don't think there is an alternative- be that alternative to them