The Volturi had their eyes on Alec and Jane (biological siblings). It was suspected that they were doing witchcraft, so they were going to be burned at the stake. That's when Aro stepped in. He turned them both into vampires and welcomed them into the Volturi clan. Also I'm assuming that they were changed into vampires sometimes far in the past (ranging from 1400's to 1700's seeing as they were going to be burned at the stake).
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Laurent
Edward was changed in a hospital in Chicago dying of Spanish influenza in 1918. Carlisle found him there and changed him.
Twilight-the end of the day, the begining of a night. New Moon-The New Moon is the darkest night of the month, because the sun does not reflect light on the moon. In 'New Moon', it is the darkest time in Bella's life because Edward has left her. Eclipse-there is a new light covering Bella's love for Edward Breaking Dawn- new passion comes in Edward and Bella's relationship because Bella becomes a vampire and they have Reneesme.
1st quarter moon . . . 7.38 days after New Moon Full moon . . . 14.77 days after New Moon 3rd quarter moon . . . 22.15 days after New Moon New Moon . . . 29.53 days after the previous New Moon.
In New Moon, we are introduced to the Volturi (which, Caius is one of the leaders of). We are also more introduced to the Quileute pack, and what the link is between the vampires and the werewolves. Werewolves are the only thing strong enough to destroy a vampire, besides another vampire. Vampires are basically the only thing that can kill a werewolf because the venom is extremely poisonous to them and kills the wolf instead of transforming them into another vampire. Caius realizes how powerful the Quileute pack is, and that is why he is "afraid" of the wolves.