Moving from PC to Mac

Hi - I have had my computer music on a PC for a few years and I use Media Monkey FLAC files. I have lots of "albums" I have purchased from HD Tracks. I am now going to use a Mac Mini as my server and I am wondering what I need to do to move the music to the Mac? I am assuming I will need a new software like Amarra but not sure if the transition will work okay. Can anyone help?

Thanks, jb