Passion, I can't remember if you're a parent? When we took that leap we laid down a very small set of simple, age-appropriate rules that have worked pretty well. For the first few years the only rules were:
Rule number one: no hurting.
Rule number two: don't do dangerous things.
Rule number three: clean up your mess.
After a few years we added four - always do your best, and five - treat people with respect.
A bit later we added six, which is the golden rule. (similar to 5, i know, but it needs emphasis)
As the kids became pre-teens we introduced number 7, which covers pretty much all behavior not noted in the first six:
Rule number seven: Don't be a dick.
With simple rules like that, if a kid ever says, "but I didn't know that was against the rules!" The reply is simple: "Sure you did -- that's rule #7."
I would think that your team rules could be and should be even more simple.