The bill's release makes the First State one step closer to joining 12 others that have passed similar laws. Thirteen others are considering it.
Operators also would have to fork over a 15 percent tax on their net adjusted revenues on top of an annual $50,000 fee.
Rep. Charles Potter said "a lot of people" throughout the state have been playing fantasy sports illegally, and he wants to regulate the industry as a way to better manage it.
Some 150,000 Delawareans enjoy the sites today, said Orrick, Herrington and Sutcliffe LLP attorney Scott Ward, who represents DraftKings and FanDuel.
"That will bring income into the state," Potter said. "If you imagine you have 150,000 people that are playing right now, that number's going to grow when it's legal, so if a person bets an average of $100 a month, you can do the math."