I didn't know too much about each sorority when I went through recruitment, and I think it was a good thing. Like Maggie said, each group is good, and I would have been happy to join almost any of them. Each group has a stereotype, but I know they've changed even since I graduated in 2004. You'll find all types in each group. A lot of the groups win awards at their national conventions.
As for recruitment itself, you'll have Icebreakers (8 houses), Philanthropy (5 houses), Sisterhood (used to be skit - 3 houses), Pref (2 houses), then bid day. It's a long couple of days, but thank goodness it's over fake break! Good luck