Jeans:
http://www.abercrombie.com/webapp/wcs/stores/servlet/product_10051_10901_510101_-1_12261_12203
http://www.abercrombie.com/webapp/wcs/stores/servlet/product_10051_10901_495488_-1_12261_12203
(get some tees at a&f, too)
other cool shirts:
http://www.hottopic.com/hottopic/Apparel/Tops.jsp
Pac Sun has somw nice jeans too, if you're looking to spend a bit less.
keep make up to a minimum, just some eyeliner and a bit of lip gloss.
for shoes, get some sneakers, flip flops, and Uggs.