Just tell the students all of the necessary information that they might need to join the course. You should specify what kind of knowledge you will cover during the course, your requirements and who is your target audience. Provide this information to be sure that you will attract the right people. Don’t forget to complete information about the details of the course such us duration, language, a maximum number of students and the category of topic of your course.
You can also set up a price of your course and invite another instructor to conduct series of courses with you.
Maybe we should give some indication of how much a course should cost, depending on the content (number of sessions, kind of documents…)