Your Deals. In addition to establishing a per-class price, also offer packages to entice people to sign up for more than one class. For example, if you intend to host classes on making soap, offer the classes individually, as well as in a group. Someone could take a class learning how to use fresh flowers in homemade soap, or they could buy a bundle that teaches them how to use those, fresh herbs, and plastic toys for kid’s soap. However you decide to price your classes, remember that the buyer will want to feel like they’re getting a lot for their money. If you can provide that in a fun atmosphere, they’ll likely be back time and time again – and they’ll bring friends.
You could try advertising more, for example, by putting up signs around the neighborhood, posting about it on social media, or having people you know spread the word. You could also try doing it in a different neighborhood that might have friendlier people, or do it in a time and place where there's likely to be a lot of people walking around the area (e.g., near a church before the end of a mass).
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.