To add a new document in Photoshop, go to File then New and select the paper size and type. To add an image, go to File then Place and select the image file. The document describes various selection, editing, and manipulation tools in Photoshop like the Marquee, Lasso, Clone Stamp, and Fill tools and provides examples of using them to remove earrings from an image, change the background color, and adjust contrast and brightness.