Designate clear and concise rules and deadlines for the classroom. Online learning is only self-paced if there's no instructor. It's the instructor's job to keep the students motivated and on topic, just like they are in a classroom. The rules and structures you create will promote learning.
Tell students upfront about the format of the class and what is expected. If a large part of the learning environment will center around discussion or if you'll be using textbook lectures, let the students know. Students respond better when they know what is expected.
Be available. Your students should not expect a 15-minute response time whenever they happen to send you a message, but giving your students access to your information is what makes you a great teacher. Be active in the discussions and possibly even set office hours. This will make your students aware of when you will get back to them and when you are available for questions.
Involve yourself in your education. Simply logging into your class, reading the lectures and taking the tests are not enough for the overall learning environment. This class may be online, but the purpose is still to educate. Participate in discussions and when something isn't clear, just like in a regular classroom, ask.
Be respectful. This type of learning does incorporate people from all aspects of life and business. When you are discussing the class topics, be respectful of others' experiences and backgrounds.
Make yourself available. Submit your thoughts on discussion questions and if possible, respond to others' submissions. Doing so will help promote healthy interaction with your fellow learners.