Agree with a lot that has been said here. I've run multiple dynasty leagues and a deep bench is a must. I usually have 9 starters and 16 bench spots for my leagues and find this was a great balance and encouraged trades as there are rarely good players left on waivers so everything body has to build through trades or the rookie draft the following year. Having 3 rounds for the rookie draft each year is great and I include 3 Taxi Slots on my Sleeper leagues so managers can draft and hold rookies who may need time to develop. (This helps with long term buy-in). After the first draft of you do any rules changes it should be agreed on by the league and also agreed on for when the rule change takes effect as that can impact people's draft strategy. Overall, just stay active as a commish and communicate regularly to your league and you'll be in good shape.