Do I need any prerequisite, such as a document certifying I live in Quebec?

Not onlya credit card with the same address  of your account (in the coverage area)

If you need a referral code this is mine K61CD, to be inserted when you are creating your plan, where the total with the taxes is shown.

The only payment methods accepted are:
You can use a Visa or Mastercard credit card, or a Visa Debit card to pay for your Fizz plans.

Other cards such as debit cards, American Express (Amex), Dinners, and others are not accepted. Foreign credit cards are also not accepted.

Also Ottawa.  If your credit card is tied to an address in the Ottawa coverage region you can use that to sign up.

as long you have a working credit card should be fine