I am a CPA and work full time for the City of Fort Worth. Retiring in 4-5 years.
The best thing I can tell you is don't focus on how to start it right now. Focus more on why you are starting it, essentially your branding and marketing. Reason I say this is there are plenty of articles out there on how to start your own tax practice. However, it's going to come down to your brand and marketing that make you successful. So, spend a lot of time thinking about what you have to offer that's better and or different, that would be appealing to your future customers.