You create the CNC code by clicking the CNC Output button. It is best to send the complete design to your cutting partner so they can make any adjustments that might be needed. They will create the CNC code.
Either way will work Gary. You do need some understanding of the router though. When you design your jobs, you would need to make sure the material being used is at the correct thickness ( 3/4= .75 " .71, .67,.73 and so on) The material thickness is critical. You will need to also set the desired settings for your dados and fit clearances. Once you have these parameters in place. Try to build your cabinet library using them. This way you can write the job to a .twd file and have your parts machined the way you want them. It is also a good idea as Dan stated to send the whole job to the cutter so he/she or Shim (Politically correct ????) can look it over for any potential problems that may show up.
I would also get in the habit of nesting your jobs and looking at the amount of flip ops you have. If you can cut down on the flip ops, your cost for cutting will probably be reduced also.
Flip operations are those parts that need machined both on top and bottom. Most of them can be corrected by placing the tenon on the top or bottom of the part.
When you nest your job, look for parts with green tenons or dados. These will indicate parts that once they are machined will have to be turned over and reloaded and machined on the back side.