It never says when he becomes a vampire but the first chapter he is in is 24. SNAP DECISION. I hope this helps :)
Riley
Riley, Victoria's "helper-dude".
I think you may be talking about Riley Beirs, the newborn vampire.
:Warning, Spoilers!: Riley is a newborn vampire in Victoria's army. He's basically her right hand "man"
Victoria's Primary Vampire is named Riley. The much smaller one is named Bree.
Riley, the first vampire of the army Victoria makes to kill Bella and the Cullens.
Riley meets Bree when he changes her but the book doesn't say.
How she got them is by bitting them! She doesn't need another person to have a newborn vampire but if u do then she had them with the first guy his name is Riley. She turned him into a vampire first!
Because eclipse is through Bella's perspective, she never saw Riley or Victoria talk to each other. You can read eclipse though Bree Tannner's (newborn vampire Carlisle wanted to save) perspective in the short second life of Bree tanner. Riley and Victoria rarely talk though because Victoria knew Alice's gift and she knew Alice would see her decide
Xavier Samuel will play Riley
Riley. He is the young, blonde newborn whom she seduced into doing her bidding.
Riley