[raincom]

Look at how trainers find customers. Usually, they go to dev conferences and give free talks; at the end of the talk, on the last slide, they mention about "call me for training". For example, Raymond Hettinger python core dev does it in his talks.

Writing books and articles helps.

Check David Beazley training on python: http://www.dabeaz.com/chicago/index.html

He charges $2750 per student. His max students are 6. Now, you can check how many classes he conducts in Chicago.

There are too many online classes, youtube tutorials, coursera, udacity, etc. These classes help those who are really dedicated to learn. There are many others, who have full time or 40 hrs a week jobs. However, their companies don't spend on training and they want to learn hands on. This is where your business fits in, until you find a steady stream of corporate clients.