how do i transfur my ipod library to my new computer
It doesn't go that way. Transfer it from the old computer to the new one, then sync your iPod.
iTunes: How to move your music from one computer to another:
This user tip should be helpful too. It refers to the iPhone, but it's equally valid for iPods as well…
Syncing to a "New" Computer or replacing a "crashed" Hard Drive
Retrieving data ...