Hi @ClementMiller, until the pandemic began, I had never used Canvas, and all of my course content was contained in Microsoft Word files.
Here is my advice to you: Start learning how to create content directly within Canvas. Copying and pasting from Word documents can result in a lot of problematic formatting. Just type your syllabus directly in Canvas using the Rich Content Editor. Learn how to use Headers for accessibility. Learn how to add links to other Canvas content (e.g. pages, assignments, discussions, quizzes). Learn how to add links to external sites.
It will be a lot of work to do this for your semester or two using Canvas, After that, it is very easy to copy content into future course shells. Trying to deal with a lot of Word files and PDF documents is going to be a headache. Just bit the bullet and learn how to use Canvas.