I think maybe you need a few years more and some practical training before getting into this. There are any number of 'wideboys' in this business, don't become another....get a proper training.
Are you intending to interpose yourself between the AOC holder and the paying client? If so how? That isn't a place you want to be, unless you know exactly how to contract such an arrangement with all parties...lot of legal traps there.
If not, then how will you audit your suppliers...? what actual 'service' are you providing.? What happens if the charter supplier lets you down...? It can happen.
What insurance are you carrying?
What happens if there is an accident or incident? What plans and procedures do you have? Have you even considered this in the contracting and money flow for liability issues...?
Just like the cockpit of an aircraft, you can do 10 hours instruction and learn to fly solo PPL....but that isn't a qualification to be a professional pilot. Same for brokers....there are good ones who act professionally and provide real value for money service, and there are the rest to just think its easy money and take a cut, but actually do virtually nothing.