A set of options appears for Brush type, Size, Shape, and Paper Texture. You can reset any of these options or begin drawing. The options for Brush type are Pen, Pencil, Marker, Crayon, Chalk, and Charcoal. Set the type by clicking on it. Pen is a good choice.
Size refers to the thickness of the line.
Use the up and down, scroll-type controls. To draw, use the mouse to move the cursor to the image. It will change to a brush. Press down on the mouse button, move the mouse and release the button to draw. This means that it does make sense to draw in small strokes.