Volumio has its own Graphical User Interface accessible through a web browser so there is no need to install any software to use it. But as it is based on MPD, you can install any client to control it; I am using MPDroid on Android, MPod on my iPhone, gmpc or ncmpc on my Linux laptop, all are working fine.
Volumio is configured through its web server, by default it gets its IP address with DHCP on the ethernet but you can configure a Wifi access quite easily. You can set a password for the configuration part with a little modification of the web interface (just do a search on this forum) so you users will not destroy the setup.
I have a PI2 with Volumio working at home with audio going through the HDMI output to a Denon AV receiver, no problems so far with the ethernet connection (WiFi is not as stable).