Going greek !?

So I’m going to be a sophmore next sem. I wanted to rush for a sorority. I was thinking KKG,ADPi or PhiDE. yes, I’m a pre-med. what are pros, cons and differences other than one is professional nd others are social.
or any reviews ?
also can I simply sign up to rush during welcome week or do i have to see a Councillor first ? I missed welcome week my freshman year so, I don’t have a clue.

Here’s the place to start: http://luc.orgsync.com/org/panhelleniccouncil