What is the bus station called in Shiyan to catch a bus to wudangshan?

I think you mean the local South Bus Station near the local train station.
In Shiyan city, you can live in Fontainebleau Hotel is suggested for you. The hotel is at No. 81, South Renmin Road and about 2.5km from the south bus station.
If you plan to live near WDS, Sunshine Hotel is suggested for you.
If you want to enjoy every corner of the moutain, it is suggested to travel on your own. The tour agency may interrupt your own plan.