GUIDE ME TO ORGANIZE A CONTEST FOR A PRODUCT

I have a physical product , it is a new board game. I am trying to get exposure for it. To this end, I am thinking of a contest where people would post videos of themselves playing the game on social media and provide the links. The video with the most likes by a specific date would win a cash price. I need someone who understands the legal aspects of this to do this properly. Must be US resident and understand local laws.