The simplest way to put in an eSport bet is to go to one of the top sportsbooks that offer eSports odds. Once you do that, the easiest thing to look for is some of the top matches of the day, and always make sure to check out stats before selecting the match you wish to bet on.
So, while esports in only 100% legal in Nevada and New Jersey, there are states in which you can access regulated esports betting: These states include Arkansas, Iowa, Mississippi, Illinois, New York, Pennsylvania, Rhode Island, Washington DC, Oregon, Montana, New Mexico, and Delaware.