My music are always in my HD but now need to use the apple music, is there a good podcast on how to use?

Hi all:
Frankly I spent all my life til now using my HD for Storing music and this is not good, i decided to look for Something like APple music or Spotify, Am sure that Apple music will be more accessible, i got my 3 free month, but I can not fully use the app on mac, is there a detailed podcast on how to use the apple music on mac? Thanks in advance.