how to get to shenzhen from hongkong airport and from there to east guangzhou station?

You can take the Airport Express to Tsing Yi and then change to Tung Chung Line and get off at Nam Cheong. Then change to West Rail Line and get off at Hung Hom station. From there you can take the East Rail Line to Lo Wu. After you pass the customs, you can walk to the Shenzhen Railway Station. You can choose a D-type which will take you to Guangzhou East railway Station.