The foremost thing to do is to find a local Real estate agent, who is a specialist in real estate investments and quick sales of property. To know more about house sale via https://www.milesre.com.au/property-management.
Remember, to approach two and maximum of three local agents, who are popular and reputed. Also, make sure that these agents are not very far from your house, one or two miles.
Secondly, if you are behind on your mortgage payments, there is a serious risk of your house being auctioned. If this is the reason you want to sell off your house, then the best option for you is to sell your house quickly and rent it back. When you have enough money you can purchase it back from the investor. There are specialists who deal only with the 'selling and renting back' scheme, like Mortgage Rescue Companies. A normal buyer will never be interested in purchasing a house and rent it back to you for a few years and again sell the house back to you. Therefore, find a good and reputed Mortgage Rescuer.
These rescuers will pay cash for your money and will also pay sales tax and other taxes. You can live in your own house on rent and you also have a future prospect of buying back your house.