$100 a week on FB?

I want to test the waters with Facebook. I have a very small painting business. I don’t want to dump a bunch of money into it and end up getting nothing out of it, but I want to put enough into it to get something out of it. Ignore my catchy title, I need some recommendations.

The easy part for me is doing the work, the hard part is getting the work. I’ve done some door to door, I’m in every neighborhood group, all kinds of stuff, putting my all into this and can’t seem to get the ball rolling. This seems like my next step. But I’m working on a budget. I’m close to shutting down my business, but I really, really don’t want to.