We keep to a strict routine. Same bedtime every night. Same routine at shower time (i.e., shower, brush teeth, brush hair). Same routine in the morning (i.e., come down, take medications, eat breakfast, brush teeth). Same after school routine (sit down at the table, homework, get snack). Every day, no change. We had to start with chart type posters up so the boys could remember when they were younger. Now, we don't need them.
Consistent consequences (i.e., if you don't do your homework, you don't play the Playstation) that NEVER change are good too. So, for instance, I don't tell them today if they don't do their homework they can't play the Playstation and tomorrow tell them they don't get snack. It's the same, all the time, every time.
My best piece of advice: say what you mean and mean what you say. Do not ever make a "threat" or promise and not follow through (i.e. "if you don't do what I tell you I'm going to ground you for a year").
Good luck