Hi there,
I'm a mechanical engineer with over 15 years experience in designing, modeling, prototyping and effective manufacturing of different products, ranging from consumer goods to alternative energy systems.
I can teach you how to work on your CNC machine - just let me know what type is (manufacturer, model and controller version), and I could also translate your dxf files into G-Code needed for machine to make its job.
As you probably know, Artcam Express has limited functionality and is just for simulation of the CNC processing (it doesn't return the g-code).
You may open a msg channel here and we'll talk more about your machine and the project.