Help with doors and buttons

[Metafrost2]

Now I decided to practice on such a thing. And, of course, in order to understand the basics, I went to the wiki. I found out that this is linedef type 480, but I didn't see how to set it correctly. There was also an example in the form of wad. I wanted to ask: how many control sectors do I need and how do I make the button that opens the door?

 

[glaber]

2.
one for the button to move down and another to move the door.