I need help with a temp agency

[hooskins]

I am a currently unemployed college student. My goal is to get a job by the end of this month and a friend suggested a temp agency. Now I have no idea how temp agencies work and how I should go about contacted them. I know it sounds stupid, but I just dont want to end up sounding like an idiot.

Should I call their office first, or should I post a resume online with them(it has both options?). Have any of you guys worked with a temp agency? What is your experience and what should I generally know. I probably wont be dont anything specialized seeing that I am a college student.