Spwan and shoot bullet in direction of shooter?

Okay so i’m new in unity and got some problem with shooting bullet in direction of shooter. Could someone help me solve this out?
Here are my classes:

using UnityEngine;
using System.Collections;

public class characterCombat : MonoBehaviour {
	#region --Pubs--
	public GameObject ammo;
	public string weaponName = "H&K";
	public int weaponMinDmg = 4;
	public int weaponMaxDmg = 15;
	#endregion
	#region --Privs--
	#endregion
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
		if(Input.GetKeyDown(KeyCode.F))
		{
			Vector3 playerPosition = new Vector3(transform.position.x,transform.position.y,transform.position.z);
			Instantiate(ammo,playerPosition,transform.rotation);
		}
	}
}

using UnityEngine;
using System.Collections;

public class bulletMove : MonoBehaviour {
	
	#region --Pubs--
		public int bulletRange;
		public float bulletSpeed;
		public GameObject shooter;
	#endregion
	#region --Privs--
		private Vector3 startPos;
		private Quaternion rotation;
	#endregion
	
	// Use this for initialization
	void Start () {
		shooter = GameObject.FindGameObjectWithTag("Player");
		startPos = shooter.transform.position;
		rotation = shooter.transform.rotation;
	}
	
	// Update is called once per frame
	void Update () {
		float distance = Vector3.Distance(startPos,transform.position);
		Debug.Log(distance);
		float move = bulletSpeed * Time.deltaTime;
		transform.Translate(startPos * move);
		if(distance >=bulletRange)
		{
			Destroy(gameObject);
		}
	}
}

I think the only change you have to make is on line 55:

transform.Translate(transform.forward * move);

This assumes that you want the bullet coming from the shooter. Your question says, " direction of shooter," which says towards the shooter. If you want the bullet to go towards the shooter, then there are a few more changes to make.

Note the typical way most folks shoot a bullet is to add a Rigidbody (which uses Unity’s physics engine).

Could you show me of example how to shoot bullet with rigidbody?