Do a search, or just browse through the rush forum, and you will find a wealth of information.
The rush process depends on what sort of GLO you're interested in pursuing. If you're going after membership in an NPC sorority, you will probably participate in a formal rush process where you'll meet members of every NPC sorority at your school, get invited back (or not) by each group, and narrow down your choices until you (hopefully) receive one and only one bid. If you're pursuing membership in an NPHC sorority (historically African-American) you will most likely select one group to pursue, and meet with them; one of the NPHC members on GC can tell you more. Multicultural, service, local, and regional sororities all have their own membership selection processes, and they can vary widely.
Hope this helps
