1. The document provides instructions for formatting a basic webpage using CSS and Dreamweaver. It walks through adding div tags, image placeholders, and CSS classes/IDs to structure the page layout and style elements.
2. Key steps include floating an image left, adding a "clearfloat" class to make text wrap below floated elements, inserting divs around main sections, and using CSS to position/style the header, sidebar, main content and footer divs.
3. The final layout has the sidebar div floated left inside the header div, with the main content div positioned to the right of it using left margin. Floating and clearing techniques are used to control element flow.