I really like the idea of a guild that focuses not only on teaching general RP, but even RPing combat, which is among the most difficult things in RP. Sangwa is right in that there should be a sort of balance between actual and RP'd skills. However, this isn't of utmost importance (and can be impossible after wipes, etc.) if you manage to stay reasonable and realistic in what you RP. But it is it's something to keep in mind, and aim for.
Never watched Naruto, but if it's a rip, then changing names and tweaking the workings is necessary. This can become one of the better things to hit PS in quite a while, it'd be a shame if it'd suffer from copy syndrome.
Regardless of originality, I think the marriage and head / branch family stuff will be a problem. Also, do I get this correct: the headmaster can only be replaced by an unmarried member of the head family, since otherwise it would not make sense to forbid him / her to marry? Also, why does marriage taint the lotus (or whatever it will end up being)?
Normally I think that new players should not start, or even join, guilds, and copying things creates a very bad feeling, but you seem reasonable and therefore this seems to justify an exception. As has been said, you will need a good deal of breath to see it through, but I hope you make it work.