I'm starting my junior year at Pitt as a biology major and am doing research for the first time this summer. It's a full-time, paid position.
Here's what I did: I went to the biology department's website and looked through all of the professors that are currently doing research (whether I had that professor or not). I emailed the professors whose research interested me. I sent out 9 emails and tailored them to that particular professor and what interested me about what they were doing. I heard back right away from 3 whose labs were full. I met with two of them who had positions available in their labs and went with the one that interested me the most. The rest I never heard from.
The two that I met with wanted a resume and a description of what my career goals were.
Good luck!