The document provides instructions for beginners on creating a new Photoshop document for web design. It recommends opening Photoshop and creating a new document sized at 780 pixels wide by 600 pixels high with a 72 pixel resolution for web use. It also notes that the background layer is locked initially and can be changed by filling it with a color from the foreground color swatch in the toolbox. The document should then be named and saved as a .psd file.