Hi I've been admitted to the faculty of engineerinf for the fall and was wondering if its possible to get any jobs on campus (like in the library or something) just to make some money!!

Absolutely, there are opportunities for you to work at McMaster part-time as a student.

Read more here: http://sfas.mcmaster.ca/work_study/jobs.html

After reading, it would appear that the International Students' Work Program is only available to upper-year students, but that doesn't mean there isn't plenty of other ways you can find a job on campus!

You can also check out what the MSU has to offer:
http://www.msu.mcmaster.ca/mirror/jobsvol.php