Our family has 3 ipod users
Our family has 3 itunes libraries linked to 1 apple account. How do move each libary to it's own apple ID or account?
Whatever Apple ID was used to purchase music stays with that Apple ID forever. You can authorize other libraries that use that Apple ID to play purchased music requiring authorization.
These may help:
Using iPhone, iPad, or iPod with multiple computers
iTunes: How to share music between different accounts on a single computer
How to use multiple iPods, iPads, or iPhones with one computer