It might be a lot quicker to find your model through cost exploration.

  1. Put up a landing page that talks about your service, and has a 'buy now' link at the bottom

  2. The 'buy now' price should be a price that you think is fair

  3. Clone that page and play with prices. One page could be priced half of what you thought was fair. Another page might be double. 

  4. Load balance those pages. If you see an even amount of people willing to pay $100 as $20, then you KNOW $20 is priced too low. Your optimal price point is after the point you start losing customers. If you can sell it for $500 to 10 customers or $50 to 100 customers, you will have made the same amount of gross revenue, but it is much easier to deliver service to 10 customers than 100 customers. 

Your best price point may be 10 times (or more) what you think is fair. It may be 10 times less. If more, well then you have opportunities for establishing an agency, as there's overhead to delegate the work and still make profit. Or you can discount it to those who need some help. Or you can play with different cost models (e.g., "I will get you hired in exchange for 10% of your first 10 paychecks" type of arrangements).