Well done on the switch, Mariam. I'm reading this for my daughter, who has just started in Canada, and your question about what to know before the final year is the one I'll forward to her.
I've just finished my master's in France and started working, which means I've done the switch from student to worker status that so many international students hope for. It worked, but it was stressful, and a lot of that stress came from not knowing the rules until the last minute.
For others who studied abroad: did you stay on after graduation? Which route did you use, and how long did it take? And for current students, what do you wish you knew about the post-study options before your final year?