As far as I know, MPH in Canada is fairly a new field compared to the US. CEPH is viewed very importantly in the US. My academic advisor discourages any of us to apply to a non-accredited program. In Canada, there is currently only 4 school that is CEPH accredited.
Hey,
Look at this website for answers to your question 3 http://www.dlsph.utoronto.ca/students/future-students/application-process/application-instructions/
Letter of intent (personal statement) is required and the component of the letter depends on the program you apply to. Two letters of reference are also required.
Hope this helps.