Changing my look for school, help?

I'm going to be a freshman in high school this August, and I want to change myself completely. I'm normally a quiet, shy girl who only has like 10 friends :( But I am losing a bit of weight, l'm dyeing my hair dark red to match my white skin better, and just looking better. I'm actually going to get my eyebrows waxed! I'm trying out for Chorus and Theatre Arts to try and break out of my shell, and on the first day of school I'm going to talk to everyone! My new status? Social butterfly :) So tell me- What types of clothes should I wear? I like hippie/chic stuff, and girly clothes too! Tell me brands, send me polyvore outfits, help me out. I have absolutely no fashion sense! I'm kinda going for an Ariana Grande look! Thanks :))