how to learn if a house is worth investing for rental

[Rudky Martin]

I am a novice investor. I am looking around to buy my first rental property. I see some single family houses in neighboring cities which can be in my budget. However I am not sure if it is easy to rent it out and how much I can expect from the rent. Should I go there and ask the local people there or something else more practical?
Could you please share your tips how do you learn these things to calculate cash flow before purchasing a property?

Thank you.