Unity 5 3D Space Movement Issues

Hello. I'm working on a scene involving the player to be in space, but i'm having difficulties with the movement scripts. I want the view to be in third person (they will be flying a spaceship) , and the camera to be moved with the WASD keys and acceleration/deceleration to be done with something else (maybe a mouse button). I don't know how many space games to motion controls so this might be a bad way of doing it. Does anyone have a script(s) for space travel in a spaceship?