Actor-filmmaker Arbaaz Khan has already begun work on the sequel to his National Award-winning film Dabangg and says the first draft of the script is ready. “Work on Dabangg 2 in on. We are waiting for Salman (Khan) bhai‘s dates. We are likely to begin the production in mid-September next year,” Arbaaz said on the sidelines of the Global Indian Music Awards (GIMA) at Kingdom of Dreams late Thursday night. The film, starring Salman Khan and Sonakshi Sinha, became 2010′s biggest blockbuster by earning Rs 145 crore. Arbaaz admits he is nervous about making a sequel. “There is a little nervousness for sure as the expectations are high but we would definitely be presenting something good and interesting,” he added.