FPS Shoooting Problem

Hi,I'm creating a simple FPS game,everything went pretty good but the shooting is not working,when I shoot the bullet just floats in front of me,and there's no sound at all(I've put the sound in correctly),can someone help?This is my Gun script.

 var Bullet : Rigidbody;
 var Spawn : Transform;
 var BulletSpeed = 100000;
 
 
 function Update () {
     if(Input.GetButtonDown("Fire1")){
         Fire();
     }
 }
 
 
 function Fire () {
     var bullet1 : Rigidbody = Instantiate(Bullet,Spawn.position,Spawn.rotation);
     bullet1.AddForce(transform.foward *BulletSpeed);
     audio.Play();
 }