My first questions would be - what experience do you have in this field?
What are your abilities?
What is your life experience and self-awareness?
How will you deal with the expectations and the rejections of others?
Will you be able to deal with them at all (and this includes the parent desperate for information and closure around their missing child who will project their emotional need onto you)?
How would you charge and what would you charge for your time/effort?

Why would you set yourself up under this title and all it implies?