Bus from Hangzhou to Yiwu

I want to catch the bus from Hangzhou South Bus Station to Yiwu and I'm wondering if you can tell me:
1. How much does the bus cost?
2. Where do I purchase a ticket?
3. Can I book tickets in advance, if yes where?
4. What times does the bus depart?
5. Where in Yiwu does the bus arrive (the address)?