You will be required to obtain state, local and city permits. Plus you will also need a business license, an entertainment license, and possibly an exibitors license. You will be required to have insurance for the fighters in case of serious injury or death, probably at least a $1,000,000 for each fighter. You will have to hire people for crowd control, parking attendants, security, and consession operators. Don't forget the state boxing commision, they will have to approve all participants and you will have to pay at least 3 to oversee the card. You will have to hire referees, ringside doctors, a timekeeper, judges, and ringside maintainance. You will need some sort of ring, you can probably rent one for $2000 for a night. As the promotor, you will also have to provide gloves for all the participants, transportation and lodging for any "name" fighters, and a minimum purse for each bout. A small time fight promoter will spend around $100,000 to promote a card. Doing anything less than the above opens yourself to the following possible actions: if a fighter was injured and required medical assistance, you could be sued for thousands of dollars, if a fighter requires hospitalization, you could be sued for tens of thousands of dollars, if a fighter is permanently disabled or dies, you could be sued for hundreds of thousand or even millions. And in the case of a permanent injury or death, you could be charge with some very serious crimes up to murder. Plus there is always the possibility that operators of so called "fight clubs" may not take lightly to you cutting into there turf and these gentlemen are VERY SERIOUS about protecting there business interests. The fight business is not something a teenager should consider as a part time job.