Create a Menu in Unity 5

I know this question is altready been asked, but i'd need some references and help in real time, so i will ask here again. I kwon how to use the UI system, like the canvas and the buttons, for example to load a scene or exit from the game, but how do i create some menù voices? I mean, when i click something the first windows disappear and the second appears, and if i click " Back " just go back to the first window. I mean, lime an option botton i a menù, or something, for example, for creating a gamebook, when the button that you will press will bring you to another window and so on.... I know it is a bittwisted like question, but i am not english so for me is a bit difficult :)

Could someone help me? Thanks a lot :)