I am a member of the Register of Qualified Genealogists (RQG) and the Association of Professional Genealogists (APG). I abide by both professional bodies’ codes of ethics and practice.
The code for the Register of Qualified Genealogists can be found here.
The code for the Association of Professional Genealogists can be found here. They also produce an article on ‘Hiring a Professional’ which will give you guidance on what you may expect from any professional genealogist.