I will arrive Beijing airport. Then I will take bullet train to Shenyang.

I have two luggage-one is carry-on, another one is free shipping by airline. Both luggage are international standard. Can I bring two luggage to take high speed(bullet);
Which station should I go (BJ -North)? How can I get there?
Do I need book ticket in advance? Can I pay it by visa?
Thank you so much