KDP is available to Canadian authors just like it is to writers anywhere else in the world, so yes you can use KDP in Canada. Once you’ve completed writing your book, you can create a free KDP account and follow the directions to format and upload the book to the KDP platform. You will also need to have a cover to upload. This cover can be self-made or you can use the tools provided by KDP’s cover design tool. Then you will choose to publish your book as an eBook, paperback, or hardcover—or any combination as you wish. KDP keeps a portion of the sale for its services and you receive the remainder, typically about 70%, as royalties.
The biggest advantage of KDP is the control you maintain over your book project. You can publish your book on your own terms; decide when you want to release your book, how much you wish to charge, how you want to market your book, and where in the world it should be sold. KDP provides sales reports to keep track of your book's performance.
Even though you are based in Canada, with access to Amazon’s huge worldwide audience, you can turn your writing into a profitable making project.