I'm assuming that the course you built the website is not hosted through any LMS (learning management system such as Blackboard, Schoology etc)
If that's the case it's not so much a question of integrating the course into Canvas as recreating the course in Canvas. You'll have to bring it piece by piece.
If your course falls conveniently into certain units it might be advisable to use modules in canvas to capture this structure.
https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-add-a-module/ta-p/1151
Then you could link to the videos already on your website in the relevant modules:
https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-add-an-external-URL-as-a-module-item/ta...
If your institution uses Canvas Studio it might be worth uploading your original videos to Canvas Studio:
https://community.canvaslms.com/t5/Video-Guide/Using-Studio/ta-p/383116
Quizzes night prove trickier - unless you built quizzes in an application like Respondus there's probably no import route and you may have to recreate your work in Canvas Quizzes: I'd go with 'New Quizzes':
https://community.canvaslms.com/t5/Video-Guide/New-Quizzes-Overview-Instructors/ta-p/384197
Although just like with videos you could link to the quizzes on your website using the same approach as for video, but you then won't have anywhere to show grades etc.
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