As an instructor, am I able to reuse course for new students? Is there a way to archive students who have finished course?
Janna, greetings! It is not recommended to reuse an entire course. Mostly because you can't archive student responses or even delete them in some cases (ex: assignments and quizzes). Your best bet is to create a new course and then copy the content of your old course to your new course.
As to getting the new course set-up, it depends on how your school works. If your school allows you to create your own courses, then you can go to the Canvas Dashboard and click on the "Start a new course" button on the bottom right side of the page. If you don't see this option then you would want to contact the people in charge of Canvas at your school.
Once you have your new course, here's the link to copy content from one course to another course - How do I copy content from another Canvas course using the Course Import tool?
Hope this helps! Kona
Retrieving data ...