In-Semester internships or working?

Hi,

I am curious as to what job opps you can expect to have during the first year of your MBA program. I am concerned about my funds and would like to work? Did anyone do in-semester internships, part time jobs, work at University (RA, TA, call center anything) and please shed light on if it made things works, the pay you received and how difficult it was. I want to start working as soon as I start my first year. Thanks!