Do some research on flipping lease options or wholesaling lease options. It is a system where you find a seller that is willing to do a lease option, some will even advertise they are willing. Then you establish the lease option with them giving you control to find a tenant to lease option it from you. Once you find someone you have 2 options. Stay as the middleman (research sandwich lease option) where you may be able to collect a little monthly cash flow, plus some cash from equity in the end. The other option (wholesaling or flipping) is to introduce the new tenant to the original seller. You collect some or all of the option consideration for making the connection and step out of the deal. Less overall money, but easy to replicate with much less risk.
I know people will say why doesn't the original seller just find the end tenant? The answer is because they are not real estate people. They don't have the contracts to use, they don't understand the process, they don't know how much to accept as an option consideration, and They Definitely don't know how to properly qualify a tenant that will have the ability to purchase in the near future. An analogy would be, you can learn to change your own oil, but why do most people take it to a shop? Why do you buy produce from a grocery store when you can have your own garden? There are a million things people do for convenience or because of lack of education in a specific area. Learn how to qualify tenants and either become good or find a good credit repair company.
There are a ton of people that NEED to sell right away for whatever reason, and are willing to do a lease option to sell. There are even more people who want to own, but haven't set themselves up right credit wise that are searching for a lease option (rent to own).
This is a true no money down strategy that can make some quick cash. It is not as glorious as the fix and flips or fix and holds like the TV shows have made famous, but it is RE investing and will help build your cash reserves with minimal risk.