How do I make my screen saver with all my pictures from my documents?

Answer 1

Right click on desktop -> Properties -> Screen saver

Select 'My Pictures Slideshow'

If you need to you can change which pictures are used by clicking 'settings'

Answer 2

Put them all in the "My Pictures" Folder and then in screensavers choose the "My Pictures Slideshow"

HINT when you set up the screen saver you can choose "settings" and change the folder if you want to, that way you can create a special folder just for screensaver images and use that.