ShooterScript.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ShooterScript : MonoBehaviour {

	public Transform bulletTransform;
	public Rigidbody bulletTemplate;
	public float bulletSpeedX = -1000.0f;


	// Use this for initialization
	void Start () {
	}
	
	// Update is called once per frame
	void Update () {
		if (Input.GetButtonDown ("Fire1")) {
			GenerateBullet ();
		}
		if (Input.GetKey (KeyCode.W) || Input.GetKey (KeyCode.UpArrow)) {
			transform.position = transform.position + new Vector3 (0, 0.1f, 0);
		}
		if (Input.GetKey (KeyCode.S) || Input.GetKey (KeyCode.DownArrow)) {
			transform.position = transform.position + new Vector3 (0, -0.1f, 0);
		}
			
	}

	void GenerateBullet() {
		Quaternion rot = transform.rotation;
		Rigidbody generatedBall = (Rigidbody)Instantiate (bulletTemplate, bulletTransform.position, rot);
		generatedBall.AddForce (new Vector3 (bulletSpeedX, 0, 0));

	}
}