Are there any good books out there I can read for Toon Boom or would the user guide be the best bet?
The user guide is definitely the best place to start. As far as I’m aware there are no other official Studio books out there. You can, however, read tutorials and watch movies both through the eLearning section of the website or through Youtube. Here is the link to eLearning:
Here are some helpful links you might want to check out: