Lore for newbies:

Vampire Clans: http://whitewolf.wikia.com/wiki/Clan_(VTM)
Mage Traditions (Orders): http://whitewolf.wikia.com/wiki/Traditions_(MTAs)
Werewolf Tribes: http://whitewolf.wikia.com/wiki/Tribe_(WTA)

There's more, like the Technocracy for the Mages and the other Werecreatures than Werewolves. Just search for them on the White Wolf Wiki.