http://panhellenic.tripod.com/FAQ.html
A great website done by the Panhellenic of the University of Washington....(Panhellenic is the governing body which oversees all sororities at each campus in North America...the word means "All Greek"")
http://students.washington.edu/%7Epanhell/
Another very comprehensive website done by the University of Mississippi Panhellenic:
http://www.olemiss.edu/orgs/panhellenic/
and the University of Texas Panhellenic:
http://www.utexas.edu/depts/dos/gle/phc.htm
That should keep you busy reading for a while!
When you get to your college, you will sign up for "Formal Recruitment' at the Panhellenic Office on your campus.
(Depending on the school, you may have to do this a few months prior to school starting, so it pays to start investigating this in advance). Also, depending on how competitive Recruitment is on your campus, it is a wise idea to get a Recommedation Form to as many individual sororities as you can. A "Recommendation Form" is where an alumna sorority member (someone who has graduated from college) fills it out and basically attests that in their opinion, you would make a fine addition to the membership of her sorority. So start asking all of your Mom's friends, female teachers and basically any women you know that went to college, etc., if they pledged a sorority in college and ask them whether they would do a Rec. form for you?
While Formal Recruitment (i.e. "Rush") is underway, you will meet ALL HOUSES on your campus in the first round.
When that is done, you decide where you would like to go for a second look, (and the sororities also decide which young ladies they would like to invite back).
And it goes on from there.....
Study hard in your last year of high school and get high grades, as your GPA can be a deciding factor as to whether you will be invited back to some houses or not. Good Luck!