You cannot transfer content directly from one iPod to another. You will need to sync your old iPod to your current computer and then sync from iTunes to your new iPod.
For instructions, particularly for content not purchased from the iTunes Store which will require a third-party utility (and always has), check out this user tip from TuringTest:
and this page on "How-to Geek":
Forum Tip: Since you're new here, you've probably not discovered the Search feature available on every Communities page, but next time, it might save you time (and everyone else from having to answer the same question multiple times) if you search a couple of ways for a topic, both in the relevant forums and in the Apple Knowledge Base, before you post a question.