I think it's not necessary, everyone knows not to hack, not to cross team, not to swear, it's like the Obvious things in a Minecraft community.
If they do, just warn them, "Don't cross team" "Don't swear".
We all do that even tho they know or don't know the rules.
Also I think it would be easier just to add a link when you join like "Click here to know about CubeCraft rules, you need to know them" that sends them to a forum with the rules ;)
If someone camps, you have to tell them it's illegal, if someone swears you have to tell them that it is illegal, so no point.