problems already

whats the ok mean behind the service red bix when turning the car on?
why does my car squeel after making a u turn or turning hard? power stering fluid? pump?
why do my breaks squeek? worn pads? dirty break pads?
why is my window not up all the way even tho it looks it and wind comes thru when on the freeway...hssssssssss!!! aghhh anoiying
even tho it was a nissan dealer and not an audi dealer ud think these things woiuld have been worked out! especialy for 15000 dollars!
also is it normal to here like a belt being driven under the hood its very quiet but i do here somthing moving under there with the hood up if u listen carfully?
well that all i got to whine about any help would be apriciated
the car is on a 6 mo 2000 mile warenty o do you think that is all warenty type stuff? this is my first car ever from a dealer so i dont know much about warenties and stuff
thanks again guys

The OK means just that, all systems check out OK.

Squealing could be the accessory drive belt or perhaps the tires (different compounds react different ways on hard surfaces), my bet would be tires (assuming Quattro) and a sharp turn. I'd need more info as to the location you are hearing the noise from though.

Pads may be worn, check the material and see how much is left... They may have used a non-OE replacement pad with a different compound that could just make more noise than the OEM variants. There is also suppose to be anti-squeak material on the back of the pads, Audi uses a pre-applied adhesive but aftermarket pads usually require it to be added before installation.

The window may just need to be adjusted, take it to the dealer, using your warranty and get it fixed. If you are feeling especially cavalier about it I'd say adjust it yourself but given you have a warranty and your long list of concerns I'd hit up the dealer and be done with it. You shouldn't have to fix a car you just bought unless it was bought of that intention which this one clearly wasn't. The window seal itself could also be deformed or loose, again a dealer concern.

There is an engine with lots of moving parts, hearing a faint noise from it while the hood is up is normal. How many miles on the car? Has the timing belt been replaced? If so, how long ago? Accessory belts, when were they last serviced or at least inspected?

No offense but you mentioned you had a Z28 and some previous knowledge of cars, but these are all rather common and non-platform specific concerns that most DIY'ers should be somewhat already informed of. Take the car to the dealer, you have a warranty and shouldn't have to be troubled with problems, plain and simple.