ADVANCE FOR SUNDAY AMS, JAN. 8, WITH STORY SLUGGED BC-SUSAN BAYH (NA10-Jan. 5) ATTORNEY BECOMES INDIANA'S FIRST LADY -- Susan Bayh, an attorney at an Indianapolis law firm, will become half of the nation's youngest gubernatorial couple on Monday when her husband Evan Bayh is sworn in as governor of Indiana. Mrs. Bayh, 29, a native of Pasadena, Calif., plans to continue working three days a week as a lawyer for Eli Lilly & Co.