GTA 2 Movement Script

Hello I am trying to write game like GTA 2 in 2D(camera from the sky). I don't know how to do, that character looks in some direction and it moves in this direction, when user press up arrow. Sorry for my bad english. Please help.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerMovementRPG : MonoBehaviour {
     public float speed;
     public float turnspeed;
     Rigidbody2D rbody;
 
     private Transform playerTransform;
     private Vector3 relative;
 
 
     // Use this for initialization
     void Start () {
         rbody = GetComponent<Rigidbody2D> ();
         playerTransform = GameObject.Find("Player").transform;
     }
     // Update is called once per frame
     void FixedUpdate () {
         
         //Player.transform.rotation = view;
         //playerTransform.rotation = Quaternion.Euler(view.x, view.y, view.z);
         //Vector3 playerPos = playerTransform.rotation;
 
 
         Vector3 playerPos = playerTransform.eulerAngles;
         
 
         float moveHorizontal = Input.GetAxisRaw ("Horizontal");
         float moveVertical = Input.GetAxisRaw ("Vertical");
 
 
         Vector2 movement_vector = new Vector2 (moveHorizontal, moveVertical);
         rbody.MovePosition (rbody.position + movement_vector * speed * Time.deltaTime);
         if (Input.GetKey (KeyCode.LeftArrow)) {
             if (playerPos.z > 93 || playerPos.z < 87) {
             transform.Rotate(0, 0 ,1 * turnspeed * Time.deltaTime);
             }
         }
 
         if (Input.GetKey (KeyCode.RightArrow))
         { 
             if (playerPos.z > 273 || playerPos.z < 267) {
             transform.Rotate(0, 0 ,-1 * turnspeed * Time.deltaTime);
             }
         }
         Debug.Log(playerPos.z);
 }
 }