Hello, subject, I&;ll give you an answer.
Generally speaking, if you want to arrive at the earliest, you can only stay in Shenzhen for one night and pass the customs at 6 am, but this is obviously not a good way.
If you come from Guangzhou, you should take the bus or subway from your residence to Tianhe Station, and then take the MTR intercity through train. The earliest flight from guangzhou east railway station is Z801, which leaves at 08: 19, and you will also pass Changping at 09: 03, and then arrive in Hung Hom two hours later. It is located in the center and is a good starting point for sightseeing.