What are the requirements to become a Southern University Dancing Doll?

I am only a sopre in high school right now, but I want to get started in learning how to do and perfect the things you need to know when you try-out. I did a year of twirling baton until it was opted from the band (my director doesn't like majorettes), so i did some form of dance. Also I was wondering when I'm a senior in high school would I be able to try-out for the next year Dancing Doll line for the upcoming year when I am a freshmen in college? And my last question if i receive a band scholarship would I be able to be a Dancing Doll? I know that is a ton of questions kind of put into one, but I want to go head and get all the information I can get.