The only thing in my oppinion that you should watch out for is that fact that some things will have to touch the common ideas and myths around vampires.
As long as people see some things as how they have been hearing them, then introducing other variants and things won''t be to hard.
I think a lot of folk would find it hard to play a vegi vamp
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Also I would stay clear of the clan, cell, what ever idea.
It would be better to have like a messed up world where for example each town has it''s vamp society, driven together by perhaps the human populace... Or something like that.
I would however remain with the idea that there are higher members in an organization who in turn are more powerfull. Be it physically or by the use of some powers, etc.
As for ghouls..
I think this is pretty open to interpertation. Some myths place them as servents to vamps, made by their masters, while others just use them as underworld figures praying on the dead and living alike. Much like a zombie for that matter.
just my 2 cents
well good luck to ya
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