Roon has to have a core to work.
Once you commit to roon, you will want a stand alone core, whether it be a ROCK, a Nucleus, or Roon Core running on Windows. I've gone with the former.
Roon has a free trial. You can install the core on your laptop (or better on a wired desktop if possible), and then install the control ap on either your laptop or your phone.
Your roon ready player (streamer generally) will be your "endpoint". Go to "settings" "audio" to enable your endpoint. It should show as attached to your core.
It may be a bit confusing when you install because there is one install program. You will be asked during the install if you want to install the control program, the core, or the endpoint.