@Bruce also unfamiliar with rhino myself, but it seems to be aimed at the modelling aspect, and not necessarily specialized in slicing, even if it has some capability.
My guess is that you are better off making/editing your models in it if you are comfortable with it, but exporting the model to .stl or so, and then use cura or similar slicer to arrange the print, make supports, infill, etc., and finally generate the g-code. Cura is made only to do that, so is likely more capable, and there will be way more community support to help.
Creality's "cura" comes with profiles for their printers (ender-6 is the exception not in there yet I think. have to edit ender-5 or something). You can use these, or else refer to to help you set up the right settings/parameters if you do use rhino or something else.
Since you already bought it, I guess you can try, see, and don't forget to report good luck and have fun
edit: sorry i had it mixed up about slicer profiles:
- Creality Slicer (as of v. 4.2.1) does have a built-in Ender-6 profile.
- Ultimaker Cura (as of v. 4.8.0) does not have Ender-6, but you can make one easily enough by modifying a copy of a different Ender (adjusting build size, print speed, etc. to suit the 6).