Welcome to MobileRead, DangerMouseUS
Amazon has a great CS response, and you have 30 days to return if if it doesn't suit your needs, just pay return shipping.
Just so you can learn a little more about it, here is the support page with lots of FAQ's, and you can download the users manual to read further in depth, especially about the mp3 aspect........I"m sure nook has a similar page.
http://www.amazon.com/gp/help/custom...deId=200503360