This class is self paced. You can begin whenever you like and then follow your own pace. It's a good idea to set goals for yourself to make sure you stick with the course.
You have up to one year to complete your course.
Yes! The point is for you to learn what YOU need (or want) to learn. You get out of the course what you put in. You will need to complete the assignment at the end of each module.
Learn actively, be ready! You will retain more of what you learn if you take notes, draw diagrams, make notecards, and actively try to make sense of the material.