Battle Ship 3D game - Suggestions please

Hi , I am about to make a 3D game consisting of a ship that fights other ships, it shots them and in return the other ships shoots this ship. There are some sound, explosion and water effects, the ship which is shot should sink in the water.
I want to make a scene of water with some terrains but I am having a little bit difficulty with that, so any suggestions for making the scene, and any suggestions for the whole game.
Thank you in advance.

Read the tutorials. Everything you need should be in there. Try searching on the forums as well for some of the existing ships-in-water projects to see what they have done.

If you have specific questions feel free to come back with them but we can’t design your whole game for you.