The "How to start your own Correspondence Course" info exists already...

But it's not plainly visible.

JF (Jim) Straw talks about developing your own course for teaching live, in his 17 reports thingy.

Just do that, but make it via the mail.

A month a chapter of a book. The author's already done the work of segmenting it.

Same applies to stuff you've created yourself. A chapter a month.

Tests are done on sent in Worksheets. Grab an old maths book to see how they ask questions at the end of each chapter. That's your worksheet template to adapt.

Hope this helps.

Michael Ross