How do i find someone to sponsor my new buisness venture?

i am looking to set up my own boxing gym,in the area that im living there is a high demand,and would be a fantastic opportunity for young children and adults alike,i have had experience in the boxing world all my life and am a 6 times welsh champion,silver medallist at the gaelic games,semi finalist british aba,as-well as 3 bronze at the golden gloves,so as you can see this would be a fantastic business opportunity,i thank you for taking the time to read about my business venture.