Who will teach your course? And how will students be enrolled? The settings that you choose for your course enrolment will determine these things.
After a site Administrator or Course Creator has created a blank course, (s)he can assign a Teacher to build the course.
In order to assign a teacher to a course, the teacher first needs an account on your site. If you need to manually create the teacher's account, see Preparation Task 1: Create Test Accounts for a Teacher and Students in Chapter 3.