Luggage check / health check

I am flying Amsterdam-Beijing-Guangzhou-Auckland. I stop over in Beijing for two hours, then continue to Guangzhou. After six hours, I fly to Auckland. I will not leave the airport. If I check in my luggage in Amsterdam through to Auckland, do I:

1) Collect my baggage in Beijing or Guangzhou?
2) Go through the Health inspection?
3) Go through the Customs inspection?
4) Go through the Frontier inspection?

It would be very helpful if you could tell me the steps I have to go through, from arriving in Guangzhou, to leaving, taking into consideration my stay at the Guangzhou Airport Transit hotel. This is my first time travelling through China.

I am a New Zealander.

Thank you,