Hi, welcome to the forum!

I'm not sure you'll find much information on this site for TB6560 builds as most people on here are building larger routers and these control boards don't have the best reputation. Shame really for you, I just sold a TB6560 board, 24V PSU and 3 steppers on fleabay for £40 a couple of weeks ago after having it for the last 5 years sitting in a box. Running things at 12V will give you no speed, conversley you don't want to run the TB6560 at any more than 24V or else the dreaded magic smoke comes out.

To be honest you'll be best off buying a cheap 3020 Chinese CNC router off ebay...