how do i put my music from my ipod to my itunes?

- For iTunes purchases:

iTunes Store: Transferring purchases from your iOS device or iPod to a computer

In iTunes 11 use Control+B to show the Menu bar then go to iTunes>File>Devices>Transfer Purchases

- For other music you will need a third-party program like one of those discussed here:

Recovering your iTunes library from your iPod or iOS device: Apple Support Communities