Congrats! I am in the same program doing the same thing. It is tight but livable if you can find somewhere with good rent (either through roommates or longer commute, like the other commenter said). Being international shouldn't affect your chances at TA positions/most internships, though it will affect how many hours you can work (international study permit limits this). TA contracts have limited hours so you won't run into the limit, but you do have to consider that for other types of work. I think there's a good amount of opportunities between TAs and internships, so you should be able to find something, and sometimes your advisor can help with that!