As a DMR newbie, what is attracting you to DMR Plus specifically? The above answers are correct, you either need a hotspot or a nearby repeater connected to that network. Having access to both here, I don't see a compelling reason to choose DMR Plus over Brandmeister. Nothing says you can't use any network, maybe start with whatever it is you can access first and refine your operating choice from there.
Mark K5LXP
Albuquerque, NM