There wasn't a single source or thing I referenced per se - I am very business-minded (I have had businesses before, and I also had a private practice back in Ohio I started like 4 months after internship/getting licensed). I do a lot of research on places like Youtube, I read articles online from others who have started successful businesses. I do my own web design, marketing, etc., so I do a lot of research in areas of SEO, marketing, web-design, and many other aspects involved with owning and operating a business. I am literally a one man show, so I do my own scheduling, screening prospective patients, created my own templates, consent forms, etc.; I applied for the insurances on my own (I did not pay a 3rd party company to apply for them on my behalf). I have taught myself a lot of aspects of using insurance, billing, etc. I am still learning. A big part of being a business owner is having a healthy sense of curiosity to explore/learn new things, refine as you go, adapt from others who have been successful, but also put your own stamp on things. This is my baby, so I have complete control over my brand, how things operate, and providing a solid customer experience. My work in the VA as well as my own experiences receiving healthcare services have shown me what I like and do not like in terms of patient/customer care. Remember, there are plenty of options for folks out there, so there is a lot of salesmanship going on, especially if you elect to be a cash pay practice. I would recommend considering what it is you hope to get out of private practice vs. what you could get working for an organization or a group practice. Knowing your values will help guide you in your decisions as a business owner. For example, I've recently turned down some pretty lucrative contract options for forensic work as well as with a major referral source/organization because they significantly diverged from my values. I have a lot of options in my practice where I can afford to turn away more people than I accept. I am not desperate. Consider these things as you venture out into yours. Hope this helps.