Good question.

A GUI will be easier to get into - you can use a gui file browser app to learn the layout of the file system, you can use a GUI text editor to change config files, that sort of thing. It’ll mean you can do a few basic things intuitively which will be less intimidating. So from a maintaining momentum and morale point of view it might be best to have a GUI initially even though you have to learn all the cli stuff eventually anyway and you’ll most likely be running a headless server on real hardware eventually.