Guidelines for travel to Canada from international destination and then connecting domestic flight - CDN citizen

I have been searching for an answer to this but have not been able to get a definite answer. I am a Canadian citizen and will be flying from a foreign destination to Toronto and then have a domestic flight from Toronto to Vancouver. How would mandatory self-isolation of 14 days work in this case (self-isolate at Toronto or at Vancouver)? What other guidelines should I be aware of and what type of questions should I ask my airline? Any suggestion would be helpful because at this point I can't find any answer specific to this situation (foreign-YYZ-YVR).

Thank you