Bus from Hangzhou

Hey,

this site is really helpful. Thank you first!
We wanna travel to Tunxi and the Yellow Mountains the next week from Saturday morning till Tuesday evening and choosed the way from Shanghai via Hangzhou by fast train. After that we wanna take the bus to Tunxi.

Can you please tell me where the bus from Hangzhou might start? Is it far away from the railway station? And do you have a timetable for us?

Thank you :)