It's your course. Whatever you want added to your course, it's your job to add it. Canvas doesn't set up weekly discussions. You do.
If I understand correctly, you'll be setting up your course in a development ("sandbox") course. Then once you have your actual Fall 2023 course shell, you'll want to "import" the course content from the development course. That's easy to do.
I recommend that you set up everything in your development course except for the dates. Wait until you have imported the content into your actual fall semester course. Then assign the dates for the discussions, assignments, quizzes, and so on.