Finnick arrived in Atia in January 2012 where he attacked Steve Rogers with his trident thinking that he was in a new arena. His first friend outside of Katniss was Cassie Ainsworth, whom he grew and stayed close to.
His Canon Point was originally when he had just been reunited with Annie in District 13, but in September 2012 it was updated to the day after his wedding.
Initially Finnick crashed on Katniss's couch and with Cassie, periodically wanting to stay in a hut he built on the beach since the water comforted him and reminded him of home. Finnick began to work at Mao's as a sex worker, figuring he was good at what he did, he had almost a decade of experience in the trade and he preferred the uncomplicated and unattached sex he had with clients rather than a collar partner.
By working there he was able to save up enough money to get a beach house in the first district which he shares with his roommate, Kitty Pryde. They have also taken in Gale Hawthorne and Peeta Mellark when they had passed through Atia.
Finnick also bartends at the Axiom Lounge when there are free shifts.
During a curse Finnick found himself wed to Rose (Vampire Academy) whom he had originally detested. Once the curse wore off the two still had a pull to one another and began a relationship until he was sent home for a few weeks where he married Annie and couldn't be with Rose when he returned. He also returned to sex work for the reason to have detached collar loosening.