These are some books/links that might help you produce and market your lesson channels.
1. Understand how levels should be designed.
We suggest following the Common European Framework of Reference for Languages: http://en.wikipedia.org/wiki/Common_European_Framework_of_Reference_for_Languages
2. Design your courses.
Recommended: "Curriculum Development in Language Teaching" by Jack Richards
Amazon link: http://www.amazon.com/Curriculum-Development-Language-Cambridge-Education/dp/0521804914
3. Integrate radio production techniques into your lesson production to help maintain student engagement.
Recommended: "Beyond Powerful Radio - A Communicator's Guide to the Internet Age" by Valerie Geller
Amazon link: http://www.amazon.com/Beyond-Powerful-Radio-Communicators-ebook/dp/B004W7DO2I
4. Use Inbound Marketing techniques to promote your lesson channel.
Recommended: "Inbound Marketing: Get Found Using Google, Social Media, and Blogs" by Brian Halligan and Dharmesh Shah
Amazon link: http://www.amazon.com/Inbound-Marketing-Found-Google-Social/dp/0470499311/
Recommended: "The Facebook Era: Tapping Online Social Networks to Build Better Products, Reach New Audiences, and Sell More Stuff" by Clara Shih
Amazon link: http://www.amazon.com/Facebook-Era-Networks-Products-Audiences/dp/0137152221