After the patent application is authorized, how much do you mean to pay the patent office every year? It should mean the annual fee, which is paid by you before the transfer and by the other party after the transfer.
As for how much it will cost, the annual fees for invention patents and utility model patents are different, and deferred fees and no handling fees are not the same thing. Specific data can be found in the official website of the Patent Office, with a detailed list.