Hi, I would like to know the information about picking up my train tickets.

I just booked 5 train tickets from Beijing to Wuhan on 2014/9/06 (9:49), I would like to know;
1. where can I pick up the paper tickets
2. when do i need to pick it up?, Can i just get the tickets on the travelling day?
3. How can I pay for these tickets, can i just pay on that day?
4. any documents i have to prepare to pay and get the tickets such as passport copy?
Ps. I'm currently in Beijing.
Thank you