As a follow up to my above post, I have received a lot of feedback from teachers on this topic. If you are interested in the result of this, I wrote a post on exactly what you need to get started teaching English online.
Here is the link:
Teaching ESL Online How to Teach English Online: What You Need to Get Started
I'd love to know everyone's feedback on this article; you can contact me here or through my website. I really love helping teachers with questions about how to teach online.