Hi, could some one explain me how to play this game?
I'm only able to move the 2 cars around.
In addition to moving the quads around, you can click on buildings (like your construction yard) and build more buildings + units.
(Probably also helps if you've played the original game also)
For a great video (and discussion on RTS games in general), I'd recommend checking out the Lazy Devs Academy's video(s):