The first thing you probalby should do is to get a list of the fraternities on campus. Take a look at their national pages (if applicable) and local pages. That should give you an idea of what they are about, projects they work on and their history. While the pages won't tell you everything about the Fraternity, you should beable to gain some idea.
Next, Talk to your friends you know who are greek, and those who are not. Talk to the brothers of the different groups. Between the reading and talking to others, and seeing the interaction of the brothers, you'll find out which one might suit you to focus in for rush.
I'm not really sure how Rush is handled at the fraternity level. One good Rush site to look at though is Everything Rush at -
http://www.geocities.com/CollegePark...4161/main.html
hope that helps..
Artimis
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Beta Chapter Alumna and Founder
Alpha Sigma Kappa - Women in Technical Studies
Sisters by nature; Friends by Choice