Now, I know someone could say the cost should be "negligible" couple of hundred dollars a month, in comparison to the whole buildout budget, but still I do want to know what are the best practices out there.

But I thought the whole idea of dscr was about the income from the property and no income verification of buyer.

If it's empty one month you loose a whole year of positive cash flow.  

I think the first thing you should do in this situation is figure out what you are trying to achieve and what your end goal is. 

That on his own is a great achievement.

High rent growth areas are likely to achieve positive cash flow quicker than low rent growth areas.  5 years for cash flow seems reasonable in many markets.  

I would do some research in whole area and get a better idea of what you can do.

You're paying for your agent's connections, their negotiating skills, and their local knowledge and experience.I would start with telling your agent what your investment goals or strategies are, and how they've helped others achieve that goal. 

My partner and I purchased a single-family residence last year intending to live in it for a while, however, our whole mindset changed when we read @Scott Trench's book "Set for Life".

Again just to reiterate, this is specifically for those who are NON-US citizens.I know my questions are very in-depth and seem complicated but no one in the Bigger pockets podcasts talks about how non US citizens or non-resident aliens deal with wanting to buy real estate and attempt to real their goals of achieving FIRE.