I want to make a pause button on the scene

I want to make a pause button on the scene. if i press the button it will show the guiTexture with a variety of buttons with each different script. so what steps should I do?
1. How do if I press the pause button on a scene will show guiTexture ?
2. How do I put a couple of buttons on the guitexture?

 

Have you looked at the documentation for GUI.Button? That should answer your questions about how to add buttons. You can create a MenuGUI script with your pause button. If the pause button is clicked, you pause the game by setting Time.timeScale = 0 (don't forget to put this back to what it was when you implement your resume button). You should also have a bool pauseMenu which you would set to true when the pause button is clicked.
Then you just need to put the menu window into an if(pauseMenu){ } and you're done!

 

Bear with me, I will write you a script