One awesome method is called the BRRRR method, which you can read way more about all over this site or in the book by David Greene.

I have only been able to identify a few methods for this based on my research.Literally spamming neighborhoods with "I will buy your house" type marketing.

Also, is there a quicker way to run numbers before doing the 4 square method ?

Hello BiggerPockets family! I am new to investing in real estate I’m currently renting my SFH out right now while I do some travel nursing around the country! 
I want to get started in Brrrr’ing my first multifamily ...

It's virtually impossible to get even air flow from all vents, and you usually don't want even air flow from all vents anyway as some areas will need greater volume and others less volume depending on a lot of factors such as where the room is located in the building, windows and other low-R value fixtures, exposure to south/west vs. north/east, ceiling height, etc.

None of those R's are for rate, so I don't know if there is something you're missing in the strategy?

4) What is the preferred method and frequency of communication?

I have been specifically looking into fix and flips and multi-family rental properties via the beloved BRRRR method for cash-flow. 

I have been specifically looking into fix and flips and multi-family rental properties via the beloved BRRRR method for cash-flow.

@John Morgan Thanks John I’ll start researching more efficient methods for my marketing process.