Fueliegirl...
First, what school will you be attending? I ask because then others from that school can give specific imput, while I can only add my experiences.
That being said, I think to make a good impression you need to be yourself and find something that you have in common with the members. You will be more likely to be remembered if you had an interesting convo with a sister. You can also check out these threads for more advice:
http://www.greekchat.com/forums/ubb/...ML/000514.html
http://www.greekchat.com/forums/ubb/...ML/000458.html
http://www.greekchat.com/forums/ubb/...ML/000085.html