Preparing for Rush

[PreppyPNM]

Hello everyone!
I just finished applying to colleges, and a couple of them have really big Greek programs. Now, being in a sorority is not the end-all be-all of my college experience (I am applying to six schools, four of them don't even have Greek life) but if I do wind up at a college with sororities, it is something that I'd really like to be a part of. Not because of popularity or the TV show Greek but because I really like the idea of having a second family.

I'm drama-free, I have good grades, I am nice, polite and respectful. I am passionate about community service, and I'm not just saying that.

I just have two questions:
1. What are the best ways to prepare for rush? Granted, I am not rushing until next fall, but I figured that I would start this thread now; the more advice I get between now and August 2011 the better.
2. When sororities say that they look at your GPA, do they mean your high school GPA or your college GPA?

Thanks all!