sorority recruitment

Okay, so I'm going to be a freshman in Fall 2017. I definitely am going to rush to be in a sorority and just had a few things I wanted to ask/get opinions on!

-rankings. I see you house rankings on here but how do ya'll decide? Do general rankings matter that much?

-grades. What kind of grades do sororities look for? I have a 3.87 and take a lot of honors classes but my best friend has around a 3.0.. maybe a little below maybe a little above?. Will she still get a house?

-getting into a house. Do some girls not get ANY bids? Not including girls w bad grades.

-What are houses looking for besides grades, "clicking", and a positive attitude?

-Do most girls get one of their top houses..? I'm confused about selectivity.
Thank you!!