Just leave everything at default settings, don't change anything. Your working RGB isn't really important - the embedded profile in the document will always override it (as long as you don't change any policies!)
For CMYK you need to use the profile that corresponds to the actual press and paper used, as well as what regional standard the press is calibrated to. Always ask the printer. CMYK is for offset presses only, and if you don't do that kind of work it's moot.