What does Lucien want his mother to do for Rosalie?

Lucien tells his mother that he plans to marry Rosalie to Laurent Tournier. In order for Rosalie to be ready for her role as a plantation owner's wife, he wants his mother to help educate Rosalie in the art of being a lady in planter society. To give her an air of nobility and humility. He wants his mother to help her be prepared to fit into society.