@Shola Sulaimonjust to echo what @Jonathan Greene said...1. owning properties directly isn't passive; and, 2. you won't cash flow likely at all in your first few years of ownership. 

I'd start out with David Greene's Pillar Of Wealth, that'll really help set the foundation for your personal finances before you begin investing into building out your portfolio.

Greene.

We know that the term "Buy Box" refers to an investors standard that could give him/her the green light on buying a specific property they might be looking at, if it passes that standard.I believe that I'm lacking in the correct nomenclature and can't find the correct terms to describe this idea or concept that I'm trying to convey.

Pay attention to @Jonathan Greene; slow down, sell a couple, two-three, take a deep breath, take the family on a vacation, and regroup.  

Reach out to @Josh Green.

Quote from @Jonathan Greene: You did the right thing by fixing your finances first so that is awesome.

I always like recommending David Greene's Pillars Of Wealth book as a great foundation for you to build your real estate portfolio on top of.

Check into the items listed above and if you get a green light, definitely move forward! 

If you get the green light from them, I'd happily recommend a few PMs I've worked with.