I've been thinking about writing an article like this for a while, but most of my tips are New York City specific, so it won't help most people.

Here are things I've learned from my Skillshare Class (http://skl.sh/NlGdYU) that might help you:

1. Get out of Brooklyn. Seriously. It's really really difficult to get people to come to Brooklyn. Finding a venue can be hard, but keep it in Manhattan.

2. If you NEED to have a class in Brooklyn, lower the price significantly. TELL people you lowered the price.

3. Teach your class even if only one person signs up. Some days are just bad for sign ups. Teach your class anyway.

4. Ask for endorsements/feedback at the end of your class, stress how much it actually helps you.

5. I find higher attendance rates on Mondays, Tuesdays, and Thursdays.

6. If you want your class to eventually be $39, teach 3 or 4 classes at $10. Get the positive endorsements, then up the price for future classes.

7. Blog about your area of expertise. Promote your blog, not just your class.

That's all helped me. Good luck!