Ship Newbie w/t a Zhengdefu Missile Destroyer

Hello All, I'm normally on the sci-fi and armor forum but today I was in Hobby Lobby and decided to grab one of these Missile Destroyers [U.S.S. Ingersoll] by Zhengdefu. I my first real armor builds had been a couple of their 1/48 armors which I had found on clearance. I enjoyed them, so when I saw this kit marked down to $2.99 I said to myself 'why not?'. The closest thing to a naval ship I have ever built in recent times was the Space cruiser version of the U.S.S. Yamato. I had missiles fireing off the deck and the cannons firing. Won me my first [and only] "best vehicle trophy". Figured I ought to give another vessel a shot. Let it be known that I maybe an experienced modeler but what I know about naval vessels is next to nothing. Any assistance with this simple build would be GREATLY appreciated!
The direction in the kit say that the towers and upper deck are all dark grey and the hull is light grey [above the water line]. Yet the pic all show a uniform light grey color. What colors should it be?