I'm speaking as a beginner but couldn't feel more confident in the approach of building initial wealth through frugality.

I brought them super hot deals they were happy.

I have however never needed to dray on any funds other than the LOC.I have sufficient funds to pay off my properties however that approach does not fit my investment philosophy.  

We used an approach similar to the above while living in London having lived in New York/New Jersey.

Or, if another agent from my firm brought a buyer to my listing then it would be dual agency.

Three months after closing the interpreter approaches my client with a piece of paper and told him he needed to sign it in order for hm to obtain financing for a home. 

In 2010, my younger sister brought 3 unit in Bushwick for $500K and now is worth $1.6M or buying 4 unit in Williamsburg Brooklyn 1979 for $50,000 and it’s now worth over $3M.

Something @Albert Bui brought up can't be emphasized strongly enough. 

I have a couple of clients that are dealers and the most we have done are 4 at a time which of course brought the cost done quite a bit

Depending on the size you had in mind you could use a combination of direct mail campaigns (works better on smaller properties < 50 units) or work through brokers (works across properties sizes and least painful approach).