mt-daapd needs to have read access to the music-directory. otherwise it wont start.
Edit the file /opt/etc/mt-daapd/mt-daapd.conf and make sure that you point it to the directory which contains your music.
If you leave anything else untouched, you can monitor mt-daapds progress by tailing the /var/log/messages file.
tail -f /var/log/messages
the -f option “follows” the fiel output, you’ll see. Simply press CTRL+C to abort at any time. This is also a means to check for error messages.
Once mt-daapd has completed the scanning and populating the DB, you’ll be able to utilize the web-interface at port 3689, which is a more user-friendly way to change settings. 🙂