One thing that is very important when developing courses is to have a partner or colleague that you can touch base with. Sometimes the order of content or the way things are taught may make sense to you as an individual but may not to others. Having another author or eye on the course can help you combine different teaching methods and styles to reach as many students as possible. For example when developing a statistics course I worked with an individual who specialized in application of statistics in industry, and one who was more education based. That allowed for the combination of knowledge from the 'real world' as well as input on how to best teach these concepts from an educational standpoint.