As far as dress code goes:
Skirts/shorts must be longer than your finger tips when arms are fully extended at the sides. (Not bad, that's well above the knee.)
No inappropriate content on clothing. (i.e. swearing / sexual content)
No "spaghetti" straps. (Though you can usually get away with it if you don't have your bra straps hanging out.)
No camoflauge, unless it's for JROTC. (It's a gang symbol. >_> ;; )
No headgear. (i.e. sunglasses, hoods, hats, bandannas)
No clothing with tears. (i.e. ripped jeans, though a lot of times you can get away with it.)
It's not really that bad. And you can usually get away with a lot, too.
Cell phones have to be turned off upon entering the building, though nobody really does. xD
You're not supposed to walk around listening to your iPod. Some teachers let you listen to them during class, but otherwise, you're not supposed to have them out.
My school is pretty good with this type of thing. They're pretty lenient. We're allowed super baggy Tripp pants covered in chains, and they don't care how your hair is. This kid had a mohawk gelled over a foot in the air dyed neon blue before, and the staff really didn't care.