Help with sorority recruitment!

Hello everyone! As indicated by my username, I have absolutely no idea what to expect during recruitment! I'm attending IU in the fall and I have my heart set on becoming Greek! However, I am pretty clueless because none of my relatives are Greek. I know that because IU's recruitment is so competitive, reccomendations are neccessary and I only know a couple alumnae. How would I go about getting recs? Should I contact local alumnae from my area (none would be IU alums)? And if so, how should I go about contacting them? Or is there a better way of getting reccomendations? As you can see, I'm in serious need of some guidance! Any help would be much appreciated because becoming Greek is something very important to me. Thanks so much everyone!