Cape Breton is a bit out of downtown Sydney,NS but rents in Sydney are like 700$ for a 2 bedroom which you can share with another student. So 400$ for rent and utilities
cellphone would be about 50$ a month as well
Food is a bit more expensive in Atlantic Canada as compared to Quebec/Ontario so I'm guessing about 200$ a month
I'm guessing there will be a bus pass or something so 80-100$ a month for that max.
Add it up = 400+50+ 200 + 100 = 750-800 $ a month, not bad at all
As for part times, students, especially those without work experience mostly end up in min wage jobs which are like 10.7$/hr
But I doubt it's easy to find employment in Sydney,NS. Seasonal employment at best, not something steady