Hollister?

I am going back to school shopping very soon. I am planning to get most of my stuff from hollister, abercrombie&fitch and some american eagle, and mix a few other stores in there.
My style is preppy. And i like to be comfortable.
And suggests on what i should buy?
Maybe make an outfit?
I have a couple hundred dollars to spend.
I have brown hair, olive skin, and i am 14.
I am going alot of new clothes for high school because i want to change the way i look, because last year i wore alot of boring clothes and the same stuff all the time.
I want alot of varity , styles and different colors.
Most detailed answer gets best answer!

thanks alot!
my style changed this year, i am not a poser! i just like those stores! and i didnt shop there very much last year. no rude answer please!