Visit http://scratch.mit.edu/projects/31053902/remixes/ to see CS First projects that began with this starter project.
to start drawing you have to click on the green flag and to switch colors you have to press on the color you want and to change the size you have to press on the arrows but if you want to make the size bigger you have to press the up arrow and to make it smaller you have to press the down arrow hope you like it =)