Sonja Baisden-Shell Hi Sonja! You can turn your course online by going to Course Setup > General in the left-hand navigation menu. On this page, toggle the switch from "offline" to "online".
When your course is online, that means it can be shared via link or invite for other students to join. No one will be able to suddenly find and join it on their own. You can share the course with whoever you'd like to review it first and, once you feel comfortable, invite students in.