Yes, I personally prepared my full application and scanned it all for my records (in case it gets lost etc.) and then I put it in an A4 envelope and wrote the Quebec address on the front of it in the centre.Thank you so much.
I just need to go to the Canada post and tell them I will send this documents to the this address (Quebec) by courier?
Then I took it to canada post and I can't remember, they either just used the envelope I had prepared or I got another envelope from them. I think as long as there is enough space on the envelope you prepared for them to attach the stickers it should be okay (and you wont have to buy another envelop from them).
Tell them you want to send it to the Quebec address with a tracking option and theyll tell you how much (more expensive for quicker service).