Typically people are going to want to see an example of your work. A success story.

It sounds like you are still entertaining the idea though and most likely don't have a real-world example to showcase. If this is the case, I would suggest trying to start with a close friend or family member who happens to run a business or is in charge of training for a company. You simply need to get your foot in the door. Would it hurt to provide the service for free or at least severely discounted for the first client? You want to do whatever it takes to set the first example, so you can say "hey, look what I did for them." If you can prove that you are a producer, no one will ask for your qualifications, you've already shown them.