Sellers started his racing career in karting, beginning at age 7. By age 13, Sellers was driving open wheel sprint cars, collecting 11 feature wins in his first 20 races. After competing for several years in sprints, Sellers decided to try his hand in stock car racing on asphalt ovals. He ran the 2001 season in the Limited Sportsman division at Orange County Speedway in Rougemont, North Carolina. He competed at South Boston Speedway in Virginia as a rookie in 2002, winning Rookie of the Year honors in the Late Model Stock Car division.