How have you introduced new players to the game?

To what should I agree?

ArM5 sagas develop, and aspects of them become very specific: original research, discovered Mystery Cults, Faerie courts and their gifts, exotic weapons will come up - society, philosophy and even religion develop - all this needs house rules and the work involved with it. There is no opposition between 'RAW' and such house rules in ArM5. Every saga will need some individualization: this is not D&D, after all. Some ArM5 rules are already written with troupes adjudicating them in mind: see this.

But I never had a candidate player waltzing in with his set of house rules written up for his favourite character, because "it is so much more fun". I reckon such a guy would not appear twice, though.

Cheers