Before you start working on your project, preview the Russ McMullins scratchboard tutorial.
and the video tutorial by Lars Erik Robinson
view google images for scratchboard
This artist is also an excellent reference:
Comment on the method of looking at light rather than dark as you draw. How does it alter the way you usually see and usually draw? Also comment on what you are trying to show in your drawing. Why did you choose the natural object that you did, what did you like about it, what are your aesthetic goals with this scratchboard drawing.