The main issue I see is the 25% fee, and any possible legal issues - these really need to be investigated if you're dealing with the general public and are not something to mess around with. Do not make the mistake of leaving this as something to do later.
As for the fee, if you market yourself as newbie friendly you'll get a good amount of business at first but eventually someone else WILL outdo you on the fee side of things. Don't be discouraged though - just check on the legal issues for your own safety and get going.