No idea how to even get started on this. What software do I need and what tutorial can I follow?
you can start here:
Toshiba Thrive - Android Forums
First off welcome to the forums jimmeth!
I have moved your thread into the Thrive 7" forums to receive some better assistance.
Unfortunately since you are using the 7" Version it hasn't really gotten a lot of looks, however, let me see if i can possibly assist you today!
Following the use of this program you should be able to root your device: [Tool] DaleNet Thrive Univeral Easy Flash Tool
Hope this helps!
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