Train from Hangzhou airport to Nanjing

I am planning to go to Nanjing (Jiangsu New Century Hotel Nanjing, to be precise) from Hangzhou airport via train. However I am confused which train should I take. I have searched using this website for the trains but there are Hangzhou, Hangzhou south, Nanjing and Nanjing south. May I know what is the difference?
Which train station is easily accessible from Hangzhou airport?
Which train will go to my destination (Jiangsu New Century Hotel Nanjing)?
Thank you.