How to make a camera follow an object

Hey. I have 2 questions. 1 is how to make a camera follow an object controlled by wasd and arrow keys. The next thing is i am using a code to make a projectile shoot out of the object. it works fine but when i shoot it while facing east, it seems to get blocked and not shoot out. it'll just appear then fall down. here's my code

var speed=3.0; var rotateSpeed=3.0; var bulletPreFab:Transform;

function Update () { var controller:CharacterController=GetComponent(CharacterController);

 //Rotate around y=axis
 transform.Rotate(0, Input.GetAxis ("Horizontal")*rotateSpeed,0);
 //Move forward/backward
 var forward=transform.TransformDirection(Vector3.forward);
 var curSpeed=speed*Input.GetAxis("Vertical");
 controller.SimpleMove(forward*curSpeed);
 
 if(Input.GetButtonDown("Fire1")) {
 
     var bullet=GameObject.Instantiate(bulletPreFab, GameObject.Find("spawnpoint").transform.position,Quaternion.identity);
     bullet.rigidbody.AddForce(forward.x * 4000,forward.z*4000,forward.y*4000);
 }    
 

}

@script RequireComponent(CharacterController)