Dear leonilo,
Thanks for contacting Top China Travel! We have replied to your tour enquiry, please check your e-mailbox.
For your question, Shenzhen North Railway Station is 20 km from Baoan central station, which is the nearest high-speed train station to Guangzhou. You can take metro line 5 at baoan central station, 10 stations, getting off at Shenzhen north station. It takes about 40 minutes.
After you arrive at Shenzhen North Railway Station, you can buy tickets to Guangzhou.
Any further request or question, please feel free to contact with us.
Gaby