How do you start selling real estate?

As you didn�۪t mention where you live, I assume you are interested in online real estate courses. Here is a list of where you can take real estate courses: http://www.distance-education.org/Degrees/Real-Estate-374/Real-Estate-Investment-388/. After acquiring real estate knowledge, you are required to pass the Real Estate Sales Exam in order to obtain your Real Estate License (which is required to be a real estate broker).