Airport shuttle bus service to Zhengzhou international airport

Dear Sir/Madam,
If I stay at near Er Qi square, may I know whether there is an Airport Shuttle bus service to the Airport?
How often is the interval between the airport shuttle bus service?
Which bus station should I take the Airport shuttle bus service if I stay near Er Qi Square?
What is the cost of Airport shuttle bus service for one way?
Can I buy a two way Airport shuttle bus service when I arrive at the airport or I need to buy only one way first then for return on that day when I want to go to the airport?
Hear from you soon.
Thanks
Ricky Sung.