How to apply for a master's degree after immigrating to Quebec, Canada?

You should find the answer to this question on the website of the school you want to apply for. Every school has its own different requirements and standards.

You need a language score. Generally, universities recognize TOEFL and IELTS, and some of them are acceptable (or according to the requirements of the school). Maybe Quebec has French requirements. Other papers, letters of recommendation and various materials can be found on the school website. Take notes and pay special attention to the application deadline.