I came across this setup guide and it’s free from Jerzy Drozd.
The Ultimate Guide to the Perfect Bass Guitar Setup
It’s really well done and I got more out of it than any of the videos I’ve watched. Let me take that back, I probably got so much out of it because of all the videos I’ve watched.
Coupling this guide with any number of bass setup videos on youtube makes for a pretty comprehensive tutorial.
This one from Guns and Guitars…
Or these two from from Marcelo Feldman…