Hi Baby B
I was in your shoes not too long ago. I will be rushing this spring, but began to show my interest before I was even out of high school. I began by surfing the sorority's website & e-mailing their president. She eventually gave me a call & we set up a day for her to take me on a tour of campus. I got to see the house & meet the girls & I soon began hanging out with a few of them & I now have great new friends who know how interested I am. Since they now know me, I am kept up to date on events and often invited. You did a good thing by contacting them.
My only advice is to just be your sweet self & keep in contact with them. Good luck in everything!!
Allison