To print or not to print? Whichever one you end up doing, set your Color Mode to the right one
Before starting to design a new piece of artwork, it’s worth predetermining its final resting place.
This could be simply for viewing the image on a screen, with no intentions for printing whatsoever. If this is the case then use RGB Mode in the New menu.
If you can visualise the artwork as a stunning printout one day, then set the Mode option in the New menu to CMYK, to reduce the chances of colourful surprises on paper.
The Color Mode can be set in the New dialog window before laying down a mark