My bullets wont work when i shoot them

I am making a shooting script which mostly works except one thing when i shoot the bullet dissapears and i try viewing it in #scene mode and it is behind me or under the map and i dont know why! i am very new to scripting and would apreciate any help you can provide!

Here is my script:

 var Spawn : Transform;
 var Bullet : Rigidbody;
 var BulletSpeed : float = 1000;
 
 
 function Start () {
 
 }
 
 function Update () {
     if(Input.GetButtonDown("Fire1")){
         Fire();
     }
 }
 
 function Fire(){
     var bullet1 : Rigidbody = Instantiate(Bullet,Spawn.position,Spawn.rotation);
     bullet1.AddForce(Transform.Forward *BulletSpeed); 
 }

}