I am staying at Ramada Yangzhou casa Hotel. I want to travel to Nanjing Airport by bus.

From your hotel, you can take a taxi to get to Yangpeng Jinjiang Hotel first. The cab fare is about CNY 13.
Then take direct shuttle bus to arrive at the airport directly. The bus schedules are from 05:00 to 18:30 at intervals of around an hour. It costs CNY 65 per person. The duration is about 2 hours.