Hello. If I come to Wuhan from Suizhou by Bus then where will the bus drop us off?

As I know, many long-distance buses will arrive at Jinjiadun Bus Station.
From WH to Beijing, high-speed trains depart from Main Railway Station and Hankou Railway Station. But Hankou Station is much nearer. So from the bus station, just walk northeast around 700 yards to get to Hankou Railway Station.
The train schedules are 09:24, 11:35, 15:09 and 16:11. The duration is nearly 6 hours.

Or you can take a train (only ordinary ones are available) from Suizhou railway station to reach Hankou Station.