How do a get to guangmingcheng station from Shenzhen north station?

You can still take high-speed train at SZ North Station, and get off at Guangmingcheng Station. The schedules are 11:00, 14:10, 14:25 and 17:56. It just takes around 10 mins on the way.

Or you can take a taxi from the railway station directly. The cab fare is CNY 60 to 70.

thanks Anna. IS 11:00 the earliest train of the day?

Which day are you going to travel? So I can check the detailed schedule.