So... Today I finally got my act together and brainstormed a domain name, registered the domain name and signed up with a web hosting company.
Next job is to write some content, work out what I'm going to offer first and then see about finding some students...
It's very likely that I will be offering at least one writing course for free to people prepared to help me trial the system. (I want to set up a private online discussion forum as well as the materials on the web site.)
More news here when I have things set up and ready to test.