setting for printing in Fresco

@Theresa JIt's not a matter of old/new equipment. It's not an old/new software limitation either, if it was they would ask you to send specifically a PDF/X-1a that can only be CMYK.
It's just a matter of workflow and habits, and a way that certain printers have to protect themselves from any questioning about colour reproduction.
I'd say it mostly happens because people sometimes send them RGB images with non-printable colours and then complain that the reproduction is wrong, so they force you to give them CMYK so everything is printable.
Producing an RGB image as I described above, that has only printable colours has the EXACT same output than converting those images to CMYK when the image is sent through the RIP.
Regarding blacks, keep in mind that 0,0,0,100 has two problems: First, it's not a deep black. It's rather gray and will looked bland when printed in larger areas. Second, it's not overprinting on the artwork, so it could potentially produce nasty white lines if the black plate is slightly out of registration (misaligned when printing).
I would never advise artists to use pure black for illustrations. The only case for pure black is small black text and that should always be overprinted and set up in a different software anyway.

And leaving the technical aspects aside, Nichole didn't want to subscribe to another software, they wanted to produce an image that can be sent to a print shop with Fresco.
If sending RGB is out of the table completely and subscribing a new software is a possibility, I think a good option is to use Acrobat Pro. It has the tools to convert the image created in Fresco to a press-ready PDF, convert the colorspace and even adjust black generation. And last time I checked was cheaper than an Illustrator subscription.