You can visit the websites which DubaiSis mentioned, they have lots of good info:
http://www.dphie.org/
http://sigmadeltatau.com/
While you are interested in two chapters specifically, try to keep an open mind if you do decide to go through recruitment. You never know who you'll click with until you meet them! If you want to learn more about recruitment at your school, check your school's website for a Greek life page. That will be your best source of information about dates, what chapters you have, how their recruitment works, and how to sign up. Good luck!