how do i save my old photos and put it on the new device?

Here is how to get everything:

iOS: Transferring information from your current iPhone, iPad, or iPod touch to a new device

To get photos taken by or saved to the iPod to the computer see:

iOS: Importing personal photos and videos from iOS devices to your computer

If they were synced from a computer you need a third-party program like TouchCopy or PhoneView to get them into the computer.

To move from computer to new iPod

iOS and iPod: Syncing photos using iTunes