This will let you create a master plan - really a list of each course module sequentially with the skills you need and the skills the student will acquire at each step. A really good outline tool is Dynalist
Break Down Your Course Topic into short segments and again Dynalist is just great for this.
Consider the attention span of your students no matter what your chosen course topic is. Can you even imagine how tiring it can be to stare into your computer screen for an hour? Experience shows that around 15 minutes with a short revision is around an optimum length. But it will vary by subject.
With the 15 minutes per module that you have, make sure your content is engaging. To effectively do this, you have to focus on what is important. Get straight to the main and subtopics because todays online learners are used to finding exactly what they want to learn online in minutes and then solving their knowledge issue quickly.
One of the marketing lines we find works is to present your course as "curated content" and this saves your user time - they do no not have to go searching all over the internet - all their answers will be found in your course.