I read this book way back - nearly 1 year ago - when I was planning to host a A1/A2 level German course on Udemy. But life happened too soon and all the plans of acing B2 or teaching were flushed out, along with my notes and book itself. I never got to apply any of the principles and advices offered in this book.
I found this book to be quite useful while drafting the outline and contents for the course.
Some of the actions / advices from the remains of my notes are (Note: Some of the advices are mine)
1) Gather an audience. Answer questions on Quora (and other Q&A websites) on German language, learning and teaching. Ask and explore questions about the demands and requirements of the learners about the German learning courses and reviews of the existing courses.
2) Launch course on Udemy - best platform for new teachers to host their courses followed by some videos on youtube. Once you have a follower base, you can move it to your personal website and earn money from advertising or other preferable sources.
3) Do a mid-term survey and not just on the end.
4) Follow Breanne Dyck website.
5) Interact regularly with the learners with comments and discussion board.
6) Make course interesting (regular worksheets, case studies, discussion board, practice material, quizzes and revisions).
7) Keep content easy to understand and do.
8) Initially, start with small scope of program, focus on specific areas - then expand.
Once you've moved it to your own personal website,
9) Like coursera, include brief reading, for instance, read in 45 seconds followed by, complete assignment in 5:30 mins.
10) You can track the perfomance of students using elements like the ones on Khan Academy. Track 2- 3 important elements not everything.
Lastly, closely analyse the popular online courses as well as the platforms, study the methods that made them popular.
All the best!!