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I am not able to help you with your choice of actual post processor, you have to give it a try and find out which one suits you best. I recommend you choose IMS Post Processor in Tools-Options-NC Manufacturing-Output.

I'll assume that you have defined the Manufacturing Program correctly. Open Part Operation.1 (from the tree), then Machine. There, under the Numerical Control tab you could try PPTableSample.pptable for Post Processor words table and haas.lib for Post Processing as a first choice. Be sure to input values for Min interpol. radius and Max interpol. radius, otherwise you'll have no circular interpolation.

Now you have to highlight the Manufacturing Program from the tree and select "Generate NC Output in Batch Mode" from the toolbar. Under In/Out tab you'll choose NC Code as your NC data type. Choose the name and the path of the output file and click Execute. Wait until the DOS prompt window disappears (if it wants you to input the program number do so) and you'll get your G-code.

I see that you have mentioned that you had managed to get a code with N codes...that is exactly the way your G-code should look like. In case your controller does not recognize line ("N") numbers, just erase them in a G-code editor.