Derek Sullivan has become town administrator, after serving about five months as interim town administrator. Sullivan said he signed a one-year contract that pays an annual salary of $98,500, and that he would like to stay on for a while. “I’d love to stay longer’’ than one year, said Sullivan, who wants to attract more tourists and visitors to town. “Obviously, Wareham is a gorgeous destination spot,” he said. “It’s a great community.” One of the main things he’s focusing on is budgeting for 2014 and working to “create some financial stability in the town,” said Sullivan. “I think we’re fighting a lot of same battles as other communities.” Separately, Ellen Begley submitted her resignation from the Board of Selectmen, effective Jan. 18, according to the town clerk’s office. Begley cited the need to spend more time with her family, and her decision means three selectmen’s seats must be voted on at the April 2 town election.