8 of us ladies plan to travel to Guangzhou from Shenzhen, either by coach/bus or by the bullet train. My questions are:
1. If by coach/bus, where to buy tickets and board? How much is the fare and how long the journey? Where will it arrive in Guangzhou?
2. If by bullet train, where is the station to board? I presume one buys the tickets at the station. Also how much is the fare and the length of journey? Where will it arrive in Guangzhou?
3. Which is more comfortable, the bus or bullet train?
4. Is there a luxury bus instead of regular one for the long journey?

Sorry to have so many questions. Appreciate your help.