Welcome to the club! Nexus FTW
Are your books from iBooks and your music from iTunes? I'm not sure about the iBooks, but for kindle, nook, kobo, and overdrive books there are apps to sync your collections. I have a Mac with snow leopard, and I had to get an android file transfer program to access the Nexus's memory. You can drag and drop easily. On a windows PC, you just plug it in and go.
You can also upload your music to the cloud and access via Google play music, but I haven't gotten around to it.