As requested - some information on setting up your layers in CADSTAR.
(Pull up a chair and make a coffee - its a long one).
What is all this layer stuff about then?...
So you are designing a printed circuit board - this is generally a fibreglass inner core with copper tracks on the outside. Although the inner core can be made of many different laminate materials depending upon the boards use, FR4 (Fibreglass) is the most common.
On the outside copper layers, which are completely covered in copper before the board is made - the tracks that you design will be what is left on the board when it is manufactured.