i will come from iran to beijing airport how can i get ticket for jinjiang?

Do you refer to Jinjiang in Fujian Province?
If yes, there are direct flights that can take you to Jinjiang. You needn't to change the airport. Just book the ticket in the airport.
If you want to go to downtown area in this city, you can take airport shuttle bus line 2 or line 3. About the hotel, could you tell me the exact location of the hotel? So that I can tell you the detailed route.