@Greg Yunov this is a good question. Over the years I have developed a criteria of the neighborhoods I will consider. These are B class neighborhoods where the crime is low, schools are decent, and there are strong rental rates. After you have your neighborhoods narrowed down on the crime/economical level, you need to start with the going rental rates. I base all of my investing based on cap rates so I know what return I will be getting year after year, after all of my expenses (using conservative numbers).
What you will find is that this is not easy, and it takes time to find the best combination of neighborhood, rental rates, house prices, etc. There are very few places that all of these align to make it a viable and lucrative cash flow investment, but it is possible. Take a look at Indiana, there are many places throughout that are possible for this and let me know if I can help you in any way.
One last piece of advice, do not force this. It is not easy to find a property where everything aligns, but if you are patient and keep at it, you will find it. However, the worst thing you can do it force it and buy a property that doesn't make sense.