Using xbox controller with top down shooter

I have been trying to work out how the best way to do a top down tank game using an xbox controller.

I basically have 2 objects, the tank and the turret.

I want the tank to move in the direction used on the left analogue stick, with speed relative to how much the stick is moved to its full range.

I want the turret to rotate and fire when the right stick is used

I guess the simplest way to do this would be to transform.LookAt to achieve this? ie:

 transform.LookAt(transform.position + Vector3.( Input.GetAxis ("Horizontal"),0, Input.GetAxis ("Vertical"));

Then I could use Vector3.addforce relative to the amount pushed on the left stick?

What do you think, or is there a simpler way to achieve this?