Because you cant cover every single aspect of an RPG in your tutorial (better write a book ) I'd suggest you talk with a few other people wanting to create tutorials , and coordinate your separate 'systems' to work together. This way each one can cover his system in details and how it interracts (works) with the other systems.

PS.: Sounds a little like second templates folder for RPG


Extensive Multiplayer tutorial:
http://mesetts.com/index.php?page=201