The drawing is attached to the sculpting surface by rubbing it down while applying a little pressure. It will be enough to hold it in place while transferring the drawing to the Sculpey. The drawing is transferred by poking through to the sculpting surface using a pointed tool.
The excess material can be used where additional relief is needed. There is a thin film of Vaseline between the tile and the Sculpey. Given that the excess material may be a bit softer than usual due to the Vaseline. This excess can be thrown away, I just chose to use it.