New styles and hairdo's for middle school?

I'm 12 years old and going into 7th grade. In my district 7th grade is your first year of middle school. Since I'm turning into a teenager I want a new look. I just need to know some online boutiques for older looking clothes and shoes. Also I need new hairstyles, and possibly a new haircut. If you know any sites for that too. I made cheerleading and I just need to look good and grown up.