Regarding your audio-output (Volume N/A):
Change the content of your
mpd.conf, located at
name "mpd pulse-audio-output"
name "mpd alsamixer-output"
After that open a terminal window and type
mpd + enterkey, followed by
ncmpcpp + enterkey, then hit 8key, to enter the
Outputs window (see screenshot), where you then can either choose
mpd pluse-audio-output or
One of those two should actually work for you!!
Now for your other problem (It won't dectect my music): Please refer to one of the many guides to set up mpd/ncmpcpp properly: 01 | 02 |03.
If you come across any problems during the setup procedure please edit your original question and specifically add the information there!! GL