If I have a visa for entry to mainland China, can you please advise me the best way to travel from

There are ferry and buses to reach that city.
The bus costs around 4 hours and the ferry costs around 50 minutes.
If your plane can catch the ferry at 12:15, 14:05, 17:00 or 20:00, the best way is the ferry. Otherwise you can choose to take bus, because the buses are frequent.