Beijing airport shuttle bus line 3

I am planning on taking airport shuttle bus line 3 from BJ Railway Station East Street to the Capital airport T2. Could anyone provide me a landmark where to pick the airport shuttle bus? Is it front of BJ Railway Station or across the street.

Do I pay (30 Yuan) to the driver or there will be a ticket office at BJ Railway Station East Street for the airport shuttle bus line 3?

Also, how long does it takes from BJ Railway Station East Street to the Capital airport T2 by airport shuttle bus line 3.

Thank you,
AJ