OK, heres my solution (final)

Declaration :

public class Bullet
{

    private float _shootForce;

    public float shootForce
{
    get
    {
       _shootForce = 1f;
       return _shootForce;
    }
    set
    {
       _shootForce = value;
    }
}

}

Invocation :

    Bullet bullet = new Bullet();

Execution :

    rigidbody.velocity = transform.up * bullet.shootForce; 

To create an instance of a MonoBehaviour class at runtime you have to use AddComponent because all components can't exist on it's own. They always need to be attached to a GameObject. If you want to create a script instance on the same GameObject where this script is attached to just use:

// C#
gameObject.AddComponent<player001controls>();

Ohh a little sidenote: classnames always should start with a capital letter. It get's very very difficult to read code where you mix typenames with variable names. That are some basic programming conventions.

I think you you make a prefab out of the player001controls and Instantiate it, you'll be good to go.

public GameObject player001PreFab; // set this with inspector

player001controls missileControl;

GameObject gObj = Instantiate(player001PreFab, Vector3.zero, Quaternion.identity);

missileControl = (player001controls)gObj.GetComponent(typeof(player001controls));

I recommend that you start by reading this:

• http://unity3d.com/support/documentation/ScriptReference/index.Accessing_Other_Game_Objects.html

The above link explains some of the basic concepts of how scripts interact in Unity.