We come to Kunming with 9 People and search a bus for all with Driver from Airport to the Golden Dragon Hotel.

In that city, one taxi can only holds around four people. Since you have about 9 people, you may need two taxis. So finding a taxi directly at the airport is not suggested.
For your situation, you can order a pick-up service from local tour agency.
I always use the local airport shuttle bus, so I have no idea about the price for hiring a car, so sorry for that.