Rachel McAlpine in New Zealand provides some Standards for online content authors:
The standards on this page include non-technical standards relevant to all web authors and technical standards relevant to some web authors.
I suggest you pick and choose from the long list, adapting it to your needs.
The trend is towards using content management systems, which give web content authors more control and more responsibility. That’s why I made the list pretty inclusive.
The material here is arranged in a series of check lists and looks like it will be genuinely helpful to those putting material, including courses, onto the web.