Main Emergency Number 911
Since the public healthcare system in Canada has above average quality of care, you shouldn't be too worried about which hospital you will go to. In case of an accident, simply go to your nearest one.
Travel insurance isn't mandatory but recommended. Choose a plan that offers coverage for Covid-19 and unexpected quarantine.
*this information is taken from the official CDC website
Being up to date with routine vaccinations is all you need when traveling to Canada.