New investor Analyzing Deals looking for advice

New investor here! Beginning to analyze potential deals in the Saint Louis and Dallas area markets. I always see and hear that there are still deals out there but you just have to search hard enough and I want to know what I am looking at potentially if it makes sense numbers wise. Does anyone use the site  "Rentcafe" as a source for accurate rental price research? They have an average rent breakdown by neighborhood that I figured I could use on the conservative side to plug into a calculator (no bedroom/sq ft count). 

What sites/apps do you use? 

What numbers should I be reaching for in today's market?

Thanks