Don't get discouraged. Do you have any surfaces in your 2d drawing? Madcam has to see a surface in order to work. If you only have a drawing, say of a circle you wish to cut out, you have to have a surface to select in order for Madcam to read the geometry.
Take a look at this file and see if it makes sense with the notes I included.
Feel free to PM me if you would like to talk further.