GUI text like GTA

Hello Everyone! Im new in unity3d and currently working hard for my thesis about 3d vle implementation in our school. I can i pick up an object and then it it gives me amount of points in the other hand the points are displayed in GUI text. Just like in GTA: Vice City that if Tommy picks up money it adds value to the gui text intended for current money. Please help its for my thesis purpose and i am working very hard for it.

Well, Here is a script i made it may help u,
put this script on ur money or whatever u want to pick up

using UnityEngine;
using System.Collections;

public class PickUps : MonoBehaviour {

public Transform Player;

void Start()
{
    GameObject Plr;
    Plr = GameObject.Find("Write Ur Character Name Here");
    Player = Plr.transform;
}

void Update()
{
    if (Score.Instance.ScorePointsLeft == 0)
        return;
    PickUpWhileTouched();
}

void PickUpWhileTouched()
{
    if (Vector3.Distance(transform.position, UrCharacterName.position) <= 1)
    {
        Score.Instance.ScorePoints += 80;
        Score.Instance.ScorePointsLeft -= 80;
        GameObject.Destroy(gameObject);
    }
}

}

and put this script on ur player character

using UnityEngine;
using System.Collections;

public class Score : MonoBehaviour {

public GUIStyle mySkin;
public static Score Instance;

public Texture2D Win;
public int ScorePoints = 0;
public int ScorePointsLeft = 4000;

void Awake ()
{
    Instance = this;
}

void Update ()
{

}

public void OnGUI()
{
    DisplayScore();
    DisplayWin();
}

public void DisplayScore()
{

    GUI.Label(new Rect(10, 10, 100, 20), "Points: " + ScorePoints.ToString());
    GUI.Label(new Rect(10, 30, 300, 20), "Points: " + ScorePointsLeft.ToString());
}

public void DisplayWin()
{
    if (ScorePointsLeft == 0)
    {
        GUI.Label(new Rect(50, 50, 1000, 500), Win);

    }
}

}

and thats all,… u should play with the script untile u get what u want,

First script as pickups is required in your project. I always use such script in my thesis writing management tools.