If there's any way to get a TA/RA or any position on campus that comes with a tuition waiver you MUST pursue it. That adds thousands in offset tuition to the meager wage you'll earn. I assume you're paying out of state tuition since you're going from NY to Baltimore? If so, you should look into how you can establish residency in Maryland ASAP (regulations vary state to state - it may not be possible while you are in school full time). Since you work in non-profits, have you considered the Public Service Loan Forgiveness program?
Having been in grad school for too long, I can tell you that it's very easy to rack up the student loan debt. Debt avoidance/mitigation should be your primary concern, especially since you're entering a field with a less-than-lucrative earnings potential.
You might consider a short-term sublease for the first semester so you can get the lay of the land and perhaps find fellow grad students in your program that are looking for a roommate.
As far as jobs, waiter/waitressing can be relatively lucrative at the right establishment and will allow you to work evenings and take care of school during the day. Or you can leverage any skills you have into side-gigs (e.g., web design, free-lance writing, photography). You may also be able to get a job as an adjunct professor at a local community college (although this may be more work than its worth).