How to make a "Pick Up" script?

I would like to have a script that will be able to obviously pick up objects that are able to. More specifically, how can I pull off a paper note or letter. When you click 'e' on a object, a 'paper note' gui will appear on the screen, until the player closes it. How can I do this, and how can I do this neatly and efficiently? It's inspired by the game "Amnesia: The Dark Descent".