Open the Drawing Setup window by choosing File > Drawing Size & Units… from the main menu.
Choose your drawing units, for example inches, centimeters, or points, from the drop-down list. Enter the width (w) and height (h) of your canvas size. When creating a drawing for the printed page, enter the paper size and check "Subtract paper margins." You can access the printer Page Setup… from this menu to change printer paper size and orientation.
Background let you choose from a selection of colors or textures to use as a background.
Graph Paper Settings
A layer called "Graph Paper" is included in all new drawings, and by default it is not visible. To turn on graph paper from the Layers list, click to activate the “show” (eye) icon on the Graph Paper layer to make it visible.
The graph paper layer is customizable through the Graph Paper pane in the Drawing Setup dialog. Open File > Graph Paper… from the main menu. Graph paper shows a Cartesian standard grid by default. Optionally, Artboard can display an isometric grid to assist with drawing in perspective. Grid line spacing, colors, and rulers are customizable. Note, object drawing can be set to snap to graph paper grid by choosing Graphic > Snap To > Graph Paper from the main menu.
Open the preferences menu to enable snapping to grid automatically when graph paper is visible.