Moodle is automatically populated with the courses some time before the beginning of the semester (or summer session).
Once you login to Moodle, your course(s) should appear on the right side of the page in the My courses box. Faculty will see the current/active semester's courses first, followed by past/inactive courses.
On the right side menu, under My courses, you will only see the active courses. If the courses have not started yet, they will not be displayed under this section.
You can also find your courses in your Dashboard where your full list of courses will be displayed under the heading "Course Overview". The Dashboard can be accessed on the left side menu or from the user menu top right of the screen once logged in.
The course start and end dates can be edited in the general Course Settings.