High Speed Railway from Shenzhen - Xiamen

I will arrived to Shenzhen on 29/11/14 and will depart from Shenzhen to Xiamen on 30/11/14 in the morning, so that iwould like to ask you some questions as follows:
1. If I stay at Sunway Airport Hotel (Shenzhen International Airport Guangdong, Airport & Bao'an District, Shenzhen, China, 518128), Where is the nearest railway station that I can reach to the Shenzhen North Railway station? is it Airport East station?
2. As question 1, how long is time from the railway station(Airport East) to Shenzhen North Railway Station?
3. If I buy the highspeed railway ticket from my agent in Thailand, where is the place that i can pick up the boarding ticket? Any railway station? or Shenzhen North railway station only?
4. As question 3, if I can pick up the ticket at any railway station, i should get it before 2 hours prior to scheduled departure time, right?

Thank you in advance for your feedback

Lalida