I am an international student, and do I need to fully pay my tuition fee before I get a visa to study at a Canadian University?

As per your concern here is some helpful information about your study in Canada.
No, you do not need to fully pay your tuition fee before you get a visa to study in Canada.
You no need to pay any tuition fee at all before you submit and apply for a study permit.
You need to show some financial resource