Genealogy is not an easy business to run, and for many it is a side-line as few can make a living out of it on its own. You would need much more than a couple of years’ experience doing your own family tree research. I have 30 years. You really need to do some free work for friends before you get started. I did family tree research as gifts for the birthdays and weddings of family and friends first.
You also need to be able to specialise in an area that other genealogists rarely cover. Play to your strengths. Are you good at reading old handwriting or translating Latin texts? Do you have access to less commonly used resources? Due to certain TV programs many people do think they can do it themselves without leaving the house. You cannot run a professional business using only online records even though many people think that is all you need.
I would also recommend you do some formal training so you can learn about the background to the records (which is very important) as well as learning about less used resources and research in different countries, palaeography (reading old handwriting), Heraldry, DNA and Latin – all of which can be very useful as you never know where the research will take you. In addition you need to understand the report writing formats, citing sources and recording positive and negative searches etc., and copyright issues.
Three organisations do post graduate level courses:
Institute of Heraldic and Genealogical Studies – www.ihgs.ac.uk
University of Dundee, Centre for Archive and Information Studies – http://www.dundee.ac.uk/cais
University of Strathclyde – www.strath.ac.uk/genealogy
All of these courses are done online. Passing these at Diploma level will allow you to be a member of the Register of Qualified Genealogists: https://www.qualifiedgenealogists.org/accepted-qualifications
If this has not put you off, I recommend you read other blogs I have written.