You'll need a little money to get this idea off the ground. Find yourself a nice duplex, visit the bank to get a mortgage, and then buy it. Live in one of the properties and rent the other one out. Make sure you're renting to someone who has a steady job, and no poor credit history. There are websites which can help you with vetting.
Make sure you're charging the tenant more than half the cost of your mortgage, and that plus your income from your job should build up over time. Once you have a nice lump sum ready and waiting, buy somewhere new for you to live, and rent out the other half of the duplex, again for a profit. Keep repeating this trick, leaving one home and renting it out to buy another, until you have a property empire which will give you a rental income you can retire from.