Car is barely a week old . Saw a tiny nick on the side, about an inch long so small you can't see it - one of those things you think is just dried on water streak until you rub it and it won't come off..
Get some decent car wash firstly. something like Meguires ULTIMATE WASH N WAX or Bowdens Own car wash.
If that dont remove the water marks then its a full detail/polish
for the light scratch get some Mequires SCRATCH X 2.0
If all that fails or your not confident is doing it then call in the Pro's
Best ive seen so far is http://www.autoglamour.com.au/
Just bought the Black Box Turtle Wax - It has a pre wax conditioner, a detail spray and the actual wax.. It is just for Black Cars... But OMG amazing.... It is $50 for the box from Super Cheap... But well worth the spend...
thats a perfect excuse to fully detail your exterior.
i am going to assume you dont have a buffer so what you need to do is go get your self some decent polish. i used meguires polish because it is pretty good and smells like bubble gum. it is like 28 dollars at super cheap auto