How to position objects with mouse?

Hello everyone. I searched for a similar question but did not find one, sorry if this is a repeat.

I am working on a project to create a top down game where you can click on a GUI button to place objects (such as houses, benches, tables) into a scene. My problem is I cannot figure out how to move/rotate the object once it has been instantiated. I was thinking maybe using the left mouse button to move it and right mouse button to rotate it around the y-axis.

If you could help me with a script or just point me in the right direction I would be very thankful, and would like to say Thank You in advance.

Find the DragObject script from "Unify forums". Than add things like if (Input.GetKey (KeyCode.UpArrow)) MoveUp(); if (Input.GetKey (KeyCode.DownArrow)) MoveDown(); if (Input.GetKey (KeyCode.RightArrow))TurnRight(); or with mouse buttons

I'd recommend doing something more obvious. Like you have the concept of a "selected" item (maybe it's highlighted somehow). And on that selected item you have 3D buttons you can click on to cause the object to rotate one way or another.