I created classes last year and want to use the Canvas content again this year for a new class. How do I go about importing the pages quizzes, discussions, assignments, Etc. from that class to a new class for students to sign up for?
The title of your post is a little misleading because there actually is a "Reset Course" option. You don't want to use it. Instead, you want to do as your message says and import content.
Here's a link to the Canvas Instructor Guide where there is a whole section on importing content.
In particular, these lessons will likely help the most.
If you reset the course content, know this:
All course content, including assignments, discussions, quizzes, modules, rubrics, pages, files, learning outcomes, question banks, collaborations, conferences, LTI tools at the course level, and any other content, will be deleted, restoring the course to factory settings.
The following web services are available:
Retrieving data ...