You start your turn by rolling all six dice.
If you rolled some scoring dice then you need to take some of those points before you can roll again.
You bank no points and it's the end of your turn. If this is your third zilch in a row then you lose 500 points.
Once you have taken at least 300 points you can choose to bank them and end your turn or keep on rolling the dice. But careful, if you keep rolling you could zilch out.
You can reroll any dice that you didn't score with. Once you have scored points from all six dice you get a free roll!