How do you transfer files (Music/books/pictures) from an iPAD or iPOD device to an new PC that has iTunes, but no data of files

Question

I have purchased an new PC since my oriiginal PC crashed after 5 years of use.  I want to transfer my iTunes files from my iPAD and iPOD to my new PC.
How do you transfer files (Music/books/pictures) from an iPAD or iPOD device to an new PC that has iTunes, but no data of files

Answer 1

The text below is copied from this discussion.
https://discussions.apple.com/message/11527071#11527071
Authorize your new computer's iTunes first - Store>Authorize this computer.
1) Without connecting your iPad to your laptop, start iTunes. Click on Edit. Click on Preferences. Click on Devices. Check the box next to "Prevent your iPod etc. from automatically syncing." Click OK.
2) Now connect your iPad to your laptop and start iTunes.
3) When iTunes starts, right click on your iPad under Devices in the left column. Select Transfer purchases etc.
4) After it finishes transferring all your apps to your new laptop, right click on your iPad and select Backup your iPad.
5) After it finishes backing up your iPad, right click on your iPad and select Restore etc.
6) After it finishes restoring, left click on your iPad , then click on the Apps tab on top, and check the box next to Sync Apps, then click on Apply below.
If everything on your iPad looks good after the sync, go back and click on Edit / Preferences / Devices and UN-check the box next to Prevent your iPod etc. The only other thing you may want to check is if your contacts, bookmarks, etc. are syncing correctly now. If not, go to the Info tab after connecting and make sure you indicate which features you want to sync with what sources.
This discussion has much of the same information and even some more helpful tips.
https://discussions.apple.com/thread/3305461