Convert your WMA to mp3's.
Here is a link to an App called DbPowerAmp that will convert your music to any music format such as MP3's,WMA,oggsVorb etc. with just a right click of your music file for the conversion on your computer. Then copy to your PDA or your Phone. also you'll need to edit the music to create a small song clip for use as a Ringtone. I use Soundforge for this.
http://www.dbpoweramp.com/