So international markets intrigue me, but I need to build a strong portfolio at "home" first.I'm also in a different niche than you.

In that, there is massive international competition for bad rentals, good rentals and great rentals.

I completely agree with what @Mike Nelson said.The one thing I'll add to his good advice is that each of us finds his or her own "groove" in building rapport and closing deals where you go from following the script to having it completely internalized so it's second nature.

And by preparation, I mean a combination of 'training' tenants after they are selected, and internal team development.

I live at home with my parents, and aside from the employee lease I am taking on in December, my expenses are extremely low, but my revenue has grown exponentially.

Internalize 3.

So what should I, trying to be the good 'bird-dog, wholesaler, flipper', do to provide my potential developer with enough information and yet not spend the remaining 13 'contingency' days or 25 escrow days, spinning my wheels AND IF it closes at some point, generate some revenue from it?

We have seen the potential for increase in property value improve over the years while the neighborhood has become safer. if you read the DE article "Douglas Elliman rep: 70% of Brooklyn home sales going to hedge funds, investors and international buyers", http://freewilliamsburg.com/douglas-elliman-rep-70-of-brooklyn-home-sales-going-to-hedge-funds-investors-and-international-buyers/.

But, I was able to see it for what it could be, and look at it in terms of expenses and revenue.

We have many tenants (international students) who are not Christian, so a Christmas gift would be humours at best or offensive at worse.