Have you selected drawing objects from your DXF file and created machining operations from them? If so, can you see any toolpaths display after selecting (Machining - Generate Toolpaths)?
There is a short video here which describes the basics of going from a drawing to gcode here:
I would also recomend reading through the Basics section of the documentation here:
Particularly the 'Getting Started' and 'Simple Example' pages.
I hope this helps.