Creating Simple Peg Solitaire Game in unity.

Hi am new to unity and i know little much scripting in C# ,am creating a simple puzzle game called Peg Solitaire

My question about scripting ,i arranged the pegs as shown in the image by array grid system here is My code

     public GameObject prefab;
      public int gridX = 7;
      public int gridY = 7;
      public float spacing = 6.5f;
  
      private GameObject marbleGRP;
      //public Vector2 slot = new Vector2();
  
      private int [,] grid = new int[,]
      {
          {0, 0, 1, 1, 1, 0, 0},
          {0, 0, 1, 1, 1, 0, 0},
          {1, 1, 1, 1, 1, 1, 1},
          {1, 1, 1, 0, 1, 1, 1},
          {1, 1, 1, 1, 1, 1, 1},
          {0, 0, 1, 1, 1, 0, 0},
          {0, 0, 1, 1, 1, 0, 0}
      };
  
      void Start() 
      {
          marbleGRP = GameObject.Find ("Marbles_GRP");
  
          for (int y=0; y < grid.GetLength(0); y++)
          {
              for (int x=0; x < grid.GetLength(0); x++)
              {
                  if(grid[y , x] == 1)
                  {
                      GameObject gridPlane = (GameObject)Instantiate(prefab);
                      gridPlane.transform.position = new Vector3(gridPlane.transform.position.x + x-3,gridPlane.transform.position.y + y-3,
                                                                 gridPlane.transform.position.z)*spacing;
                      gridPlane.transform.parent = marbleGRP.transform;
                  
                  }
                  //slot = new Vector2(x-gridX/2,y-gridY/2);
              }
  
          }
  
      }
      void Update () 
      {
          if (Input.touchCount > 0) 
          {
          if (Input.touches [0].phase == TouchPhase.Began) 
          {
          RaycastHit2D hit;
  
          Vector3 pos = Camera.main.ScreenToWorldPoint (Input.touches [0].position);
  
          //if(Physics2D.Raycast(Camera.main.ScreenPointToRay(Input.touches[0].position),out hit))
          if (Physics2D.Raycast (pos, Vector2.zero)) 
              {
                  print (Input.touches [0].position);
  
                  
              }
          }
          }
      }
  }

I want a little help in scripting ,How to select one peg and move it to empty slot by touching it, Please help me.Am making for Android in C#.Thanks.