You could go to the International Website zphib1920.org,
get the name of the state director for your region and email her. She should be able to help you.
I really can't give you advice about being in a Sorority, except you have to make sure it is something that you really want to do, and that you are ready for the responsibility, because it is a lot of work, not just parties, and a decision that will last a life time.
Good Luck!