The hardest way to establish order in your home is with words. If that is what you find yourself doing all day long, it's time to rely instead on routines.
Homework starts right after dinner, then TV if there is time.
Routines help children by providing cues to remember what needs to be done next without you reminding them. Establish a routine for any recurring activity that you don't want to renegotiate each time. Tie your routines to other activities or the natural rhythms of the day to provide built-in reminders. When routines involve time, be sure to give children more time than you might expect. Rushing a child can feel to the child like you are disapproving or indifference to their efforts.