how to make my bullet point to the front of my ship?

I'm trying to find an example that fits with my problem , but when I shoot the bullet only goes to a certain point .

And the strange thing is that out instead of going straight in the Z plane she will reverse .

I see here how does one use the LookAt , but I need it to do with the bullet shoot as a weapon .

var velTiro: int = 10; //speed shooting
var lookNave = Vector3.forward; //variable receives the position of the Z axis of the ship
function Start () {
}

function Update () {



transform.rotation.x = 90;
transform.rotation.y = 0;
transform.rotation.z = 0;

//transform.LookAt(Vector3.zero);
transform.Translate(0,0,velTiro * Time.deltaTime);
Destroy(gameObject,3);
if (Input.GetKeyDown("space")){

}​

already tested with : transform.Translate(0,0,velTiro * Time.deltaTime);
but the bullet only goes down .