How do I create a game environment?

Questions & Answers
1

So I downloaded blender. how do i create my environment.
i want to make a :
-ground
-background
-some obstacles like rock and building walls
-buildings
-water
something “simple” like this - http://cdn.bulbagarden.net/upload/e/e5/Petalburg_City_ORAS.png

2

There is a Learn link at the top with many good tutorials for learning how to use Unity. You should start with those.