Additional Design Notes:
You don't need to do your submission digitally – All you need is some blank or graph paper and a black pen. (Black pen will reproduce better than pencil in most cases without image editing.) What you want to do is make your design easy for other people to visualize or understand. Don't worry about making it “perfect.” What you want is something understandable.
To help this, add measurements for parts – even if they are a little rough. If you are having trouble with drawing a circle, draw what you can and add an arrow to where you want it to go. If you want a textured area or a repeating pattern, say that. You can't have too much clarity.
When you go to put your image on the computer, scanning is preferable. You want a larger image – you can always make it smaller later if you have to. (300 dpi will get you a better, more legible image.) Alternately, you can take a photograph in good light (sunlight preferable) with the best settings for image quality you have available on your camera.
What you will want is to show your idea for the front, the back, and the sides. If front and rear are the same, then you can just draw one and make a note of that. If you want something where the one side is thicker than the other, make sure to draw that and add notes about thicknesses.