How to define directions of a spawned object?

I recently posted a code about spawning object on Input, I often use this:

var Nospherebullet:Transform; var Bulletforce: int;

if(Input.GetButtonDown("Fire1") { var Nospherebullet = Instantiate(Nospherebullet, GameObject.Find("Spawn").transform.position, Quaternion.identity);

Nospherebullet.rigidbody.Addforce (transform.forward * Bulletforce); } }

But the spawned object always goes in one direction, wherever the player looks at.

Which is the code to define certain directions? (forward, up/down etc)