Make a list of startups in the space, and email a bunch of people in each, asking for advice. Good luck! The good thing about the ad space is that you can oft

Make a list of startups in the space, and email a bunch of people in each, asking for advice. Good luck! The good thing about the ad space is that you can often find a niche = 1 particular feature that someone wants that you could build. The bad thing is that it is very complex and that you'll likely need to spend time on sales.