hi @anon Maybe you could point us, if possible and free, to "the tutorial I'm watching" so to better understand what you were taught.
But UV mapping is not strictly related to materials, as you show up there.
UV are a 2d representation of a 3d surface, and need to be associated with a 2d texture, in the same UV/image editor.
Maybe add some detail of what you did and where exactly you have a doubt on how to proceed... You find (and create/delete) all UVs for an object into the "object data" properties panel.
I add this answer to show you a simple, basic example here below.
It's a basic UV map of a basic default cube.

on the right the "Object data" shows the UV map in the list (more UVs can be added)
at the bottom, you see the "add new image" for that show UV map. Maybe your tut is referring to that?