According to my experience, first of all, the house you buy should have property rights. It is necessary to have a real estate license and a land use certificate. Then the buyer and seller should sign a house purchase agreement, which is a standard contract and can be obtained in the real estate exchange. Sign the agreement, and then go through the transfer formalities with the relevant documents at Zigong Real Estate Exchange, Shitou Town, Tanmulin Street. There shouldn't be much money. In 2004, I bought a house of more than 70 square meters and spent two or three hundred yuan. Then you have to go through the transfer formalities of water, electricity, etc. In order to avoid any disputes.
You can consult others at the above address, which may be more accurate.