There are a couple of ways to do what you are trying to do. The one that requires no custom coding, you may be okay with. There is not graphical navigation option for a course. You want to design a course with 12 sections, then you probably want to set the format to display all sections at once. You can add a visual image to each section and set a completion setting for each activity. If you need help you can visit our site and find Creating a New Course in Moodle 3.0.
General help
Graphical course navigation?
This discussion has been locked so you can no longer reply to it.