One thing that is very important for a web based course is for you to plan several hours each week to work on the course on the web. Do not let yourself get behind.
This is a course in which you will need to learn new information via memorization. If you are not used to courses in which memorization is required (sometimes called "content" courses), you should set aside time each week to read the material and practice the review questions. You will also need to use the new information you are learning when you prepare your essays.
Each year, some students lose points because they "forget" to turn in their assignments on time. Be sure to put the due dates for assignments on a calendar and be sure to check it regularly.