i have had a sole propriotorship ( is that how you say it ? ) since 1988.
i file a schedule c with my taxes, and have never hired an accountant. i use a tax program (turbotax &C ).
go to your public library to see if there is any information on "score" they are retired professionals who usually were in the business you are interested in starting and they can give you insights. the world of "wet" photography hasn't changed in a long time, maybe they can help answer some of your questions.