Ipod Touch only transferring purchases music

I'm having a problem with my new Ipod Touch 5 -- only purchased music is transferring to the Ipod. It's also not transferring my playlists. All the music still plays in I-tunes on my computer. There are a a lot songs with exclamation points next to them, but there are way more that don't. Some of those with exclamation points were fine until I tried to sync the Ipod, so it looks like not only is it not transferring all my songs but it's actively destroying some of them.