ITunes is the software that gets your music to your shuffle. It will not work with getting the music to your phone.
Don't get me wrong here Pat, but the best thing you can do is find that computer geek family member or friend to hook you up.
But here is what you will mostlikely want and need to simplify the transfer
Your music resides on your computer. ITunes simply compiles a list with the location to pass it on to your shuffle.
ACC and MP3 are 2 different types of music files ACC is Apple's version of MP3.
If you want to do this yourself (again don't get me wrong here), but Google is your friend.
HERE is the results
You also need the cable to connect your phone to the computer. Then simply upload the music to the phone. Pair the phone to your BT headset, and enjoy.