OK rules. I would add:
1) Timeliness in everything we do.
2) No profanity at any time.
3) No criticism between and among teammates on the field.
No. 3 is one of my few gripes with soccer: that youth coaches often foster an environment where kids, through gestures or words, criticize teammates in a public way.
Another gripe would be the presumption by many coaches that they know more about soccer, or sports in general, than any given parent. Smart coaches, like smart teachers, encourage parents as partners in the child's development. (As oppposed to chauffeurs and check-writers.)