How can I move an object to a clicked objects (center of X,Z) coordinates (board game)?

Hello,

This is my first project.

I want to make a board game (for school project ), there are 16 objects around a board, in 2 steps I want to move an objects to the board fix position. First, the player click one of the object, and the object move near to board (because need to select firstly ) and after that clicked on one of the title of the board, the selected object move to a specified tile (not exactly equal with the clicked coordinates).

My idea: I place 4x4 empty objects into the board, and when clicked on one of target object, I want to the selected object move into clicked object center position. I hope anybody understand what i want to explain with my poor English :)

I have some questions:

1. Is the empty object good for the target positions?

2. Which move type is good for this?

3. Which object need rigid body? I don't want the objects hitting each other on a board.

4. The board needs to contains object, or simply plane with texture. And empty objects on a target positions?

I need someones who made something similar. I need idea, for the right method How need to do this right?

I trying for object moving this, which works, but it is the right way?: (the speed is a public variable)

 void Update()
         {
             Vector3 a = transform.position;
             Vector3 b = GameObject.Find("Target1").transform.position;        
             transform.position = Vector3.MoveTowards(a, Vector3.Lerp(a, b, t), speed);
         }

Thank you for your help!

Roland