Sign a real estate sales contract (available at the local real estate trading center) first, and write down your agreement in the contract, such as how to pay and how to pay by installments. Generally sign a sales contract and give him a 30% down payment, and then go to the real estate trading center to transfer, and pay 60% on the day of transfer. After you get the real estate license, give him the last 1%.
The transfer procedure is not complicated, as long as both parties have the original and photocopy of their ID cards, household registration books, marriage certificates, tax payment vouchers, contracts and real estate licenses, they can transfer. Note that both parties must be present to sign, and either party will entrust the notary office!
One-time payment means faster than the loan 1 month, and there is no difference in other things. The total time is to transfer ownership on the day of signing the contract (with all the information), get a new property certificate 20 working days after the transfer, and then pay the water and electricity bill.