some of those books look like good buys - the Pricing Strategy one especially
I had a friend who was a local design company GM help me set my initial rates and I’ve slowly raised them. He also helped with some of the initial contracts I used. Maybe you could call upon a friend that hires freelancers with your experience… as said before, it varies depending on experience, location, clients, type of work, etc
Some other Random Advice: Plan for taxes from the beginning, and it’s cool you already mentioned CPAs - keeping good records and opening up a relationship with a local tax profession keeps confusion and that kind of stress/workload down. Plus if the government ever questions your figures they will be well worth their cost