Ask HN: How to offer training to companies?

I love teaching and want to start a software programming training company that provides training in languages such as Java, Python, Clojure, JavaScript. I've done this through training companies and gotten great reviews from students.

I'm looking for ideas on how to sell my training services to companies. Basically I am a developer and clueless about marketing, and need some help. Any ideas or suggestions would be great.

If someone here has some experience and could provide some mentoring advice that would be extremely useful. Thanks!