What's a "good Cash flow" range?

[Sparkle Carlock]

Hi BP.! 

I am trying to narrow down the strategy I'd like to used to get started. As I look at properties around me, I am stuck between (1) entering REI with a flip to gain more investing captial and (2) acquiring a property for LTR. My question is: when trying to understand what type of property deal/numbers would benefit/profit, what is considered a profitable monthly cashflow opportunity?

I appreciated any advice from you! Just trying to gain as much understanding as possible before investing personal finances!