How do I pay for classes as a non-degree student? I've already earned my degree (B.S. in Neuroscience, Psychology and Music), but need to take some pre-requisite classes before applying to a Masters in Physician Assistant Studies program. These courses are going to end up costing about $10,000 total. I imagine I'll need to take out another loan, but who should I talk to first? The school? The bank?

I know very little about financing this kind of thing and am trying to avoid getting taken advantage of.

I'm be applying to school in the north eastern U.S.
You might try enrolling in a university as a non-degree seeker. Such programs allow people who already have a Bachelor's degree to take additional courses for official credit but not towards any specific degree. These programs are common and a good way to add to a transcript in order to meet minimum admissions requirements for future programs to which you might apply.