Document Color Mode should be CMYK. All swatches needing spot colour separation need to be defined as spot colours in the Swatches panel. You can convert spot colours to process when separating, so it's not as crucial to specify process colour swatches, but it's always a good idea.
File > Print. Your printer must be PostScript compatible. Adobe PostScript File qualifies. If you don't have a PostScript printer you can print to a PostScript and Distill in Acrobat Distiller or print to a PDF file, then print from Acrobat. Click on Output, then select Separation (Host-Based) next to Mode. Note the CMYK icon next to PANTONE Rubine Red C. This indicates I clicked on that icon in the dialogue to make that swatch print as a process colour.
Edit: Skip that last sentence.
In addition to what has been said while I have been struggling with Firefox crashing upon Post Reply:
I would suggest your reading what the Fine Manual has to say about the subject. A search for Producing color separations will give you a stepwise basic introduction.