There aren't a whole lot of CNLs out there, and most of the interest seems to be in the direct-entry programs for non-nurses (I have my own little paranoid theory about the development of the CNL role in the first place, but I'll spare you ...
Your best bet might be to contact the CNL programs you're interested in and ask them to put you in touch with some of their (experienced RN) graduates -- that's a reasonable request and they should be willing to accommodate you. (If not, I would see that as a big red flag about a particular school.)
Your difficulty in finding information might be telling you something significant in itself -- there doesn't seem to be a great deal of interest in the CNL role in the larger healthcare community. I follow the nursing openings in my entire region on a regular basis, and, so far, I've seen only one
opening posted for a CNL anywhere in my larger area (that's one
Best wishes for your journey!