Hi,
Don' t sync your ipod yet. You need to put songs from the ipod into the computer so if it asks you whether you want to sync click no.
Use a program to sync your ipod music to your computer
A program that you can buy and is awesome.
http://www.kennettnet.co.uk/musicrescue/
A free average program
http://www.sturm.net.nz/website.php?Section=iPod+Programs&Page=SharePod
You can also transfer songs manually
Insert your iPod to a Windows PC USB or FireWire port. (PC should runs Windows XP or other Windows operating system).
If your Windows PC still doesn’t have iTunes installed, skip this step. If iTunes is already installed and prompt a message on whether if you’d like to associate this iPod with this computer and deleting its content, click No. Or else you will lose your only copy of library on iTunes. Beside, ensure that ‘Enable Disk Use’ is selected.
Open My Computer or Windows Explorer, the iPod should be automatically detected as a portable hard drive.
Click on the iPod icon or the iPod portable hard drive letter to open the contents of the drive.
If you don’t see a folder called “iPod Control”, it’s hidden and invisible. To unhidden it so that it’s visible, go to Tools -> Folder Options -> View, and then check (enable) the option “Show hidden files and folders.”
Open the “iPod Control” folder, and then the Music folder.
The Music folder contains the iPod’s music and videos, divided into folders. Copy the library to local computer hard drive’s My Music folder.
The files copied have unintelligible four-letter file names. To reveal the names of the songs and other data tags, add the files to the Windows Media Player or iTunes libraries or switch to “Tiles” view in Windows Explorer.
Rename the file if necessary.
Beside above manual ways to copy and transfer song library from iPod to computer, or import into iTunes, there are several third party program or more commonly called iPod Manager that has the iPod copying function such as SharePod (freeware) or PodPlus (shareware).
Similarly, in Macintosh running MacOS X or MacOS 9, it’s harder to show hidden files and folders. So these third party utilities with iPod copying will be useful to transfer files and music from iPod to PC’s hard disk and iTunes library.
For MacOS X, try Broken Helix and Rob’s iPod Exporter. For MacOS 9, try escapePod and iProber. Other iPod Manager or iPod song transfer utility for Mac include Senuti, iPodRid, iPod.iTunes and PodWorks. For Linux, try GUIPod. PodUtil will be able to works on both Windows and Mac platform.