You'll need to copy everything from the old iPod to an iTunes library first before you can sync it to the iPod unless the music on the older iPod already stored in an iTunes library. In that case, just connect the new iPod and let it sync whatever content you desire.
See this older post from another forum member Zevoneer covering the different methods and software available to assist you with the task of copying content from your iPod back to your PC and into iTunes.
There is an iOS app that lets you bluetooth transfer files between iOS devices without Wifi.
It's called File Manager (Tap Media, LTD)
I was looking for an iOS app to bluetooth transfer Pages files and PDFs from a non-cellular iPad 3 to an iPhone 5. Basically, I want to write a document on my iPad, transfer it via bluetooth to my
iPhone, and email it to my editor--all without using Wifi.
Seems simple, but it's actually hard to find an iOS app that does it
-Bump is cool, but it wouldn't work because it requires a Wifi or cellular connection for both devices.
-File Manager (from TapMedia, Ltd.) will do the trick. You need to download File Manager on both devices, and the transfer isn't as simple as Bump, but it did work for me.
Here's the File Manager transfer process
On your iPad
-Open document in Pages
-Share document to File Manager
-Share document via Bluetooth
On your iPhone
-Open File Manager
-Go to Transfers screen, press "Receive" to download file
-Open file in File Manager
-Share file to Pages
-Share file in Pages via email, convert to Word
-Email file to recipient
You can use iCloud Backup to back up your previous device and then restore the backup to a new device. Your saved messages, email accounts, photos, notes, and other personal settings will be transferred to your new device.
1. Go to Settings > iCloud > Storage & Backup.
2. Turn on iCloud Backup.
3. Tap Back Up Now.
4. Wait until the backup finishes. How long it will take depends on how big the backup is and how fast your Internet connection is.
5. Choose Restore from iCloud Backup from the new one.
6. Enter your Apple ID and password.
7. Choose the backup of your old device and tap Restore. Wait until the device finishes restoring from the backup.
On you can do it in one click with this guide: How to Transfer Contacts from Android to Computer