i want to sell a really good song i wrote. who should i contact or what should i do?

[Just.Your.Janelle.]

it's a guitar acoustic song about an olympic champion's first loss in an international game. kind of inspirational. i've performed it at numerous talent shows and parties and have gotten lots of positive comments. so what should i do if i want to publish it or make something out of it? ps, i have lots of other songs too but this one is the best.