Right off, most inkjet printers will print just fine from an RGB file, so there's no need to convert to CYMK, as the printer driver will just convert the CYMK back to RGB and then to it's own interpretation of CYMK. So, instead of muddying up the colors with unnecessary conversions, just use the RGB from Manga Studio to print from.
We need to start with a colored Manga Studio file. If we're just printing out a black and white copy (with tones or gray-scale fills), we don't need to worry about color, of course. In this case, we just need to set our printer dialog to print black and white documents. Otherwise, we could get printouts that have a bluish tint.