I have about 5 agents in my office in MI who do that and each make an extra 100k + from it

I am and would also be open to building a business partnership with like minded individuals as well.

Money Mustache and the recession for getting us started on our real estate journey, and our gainful employment for saving up a bunch and the stock market (betterment account) for giving us an extra $10k or so for free.

Build multiple listings for individual units and also combined units and link them with software.

Use conventional financing to buy each 4-plex individually, but close them simultaneously.It is likely that the owner doesn't care what kind of financing you get, but their loan might be a tied loan, so untying them becomes more complicated. 

I have looked on Costar for individuals who have done 1031 Exchanges, peeped at alternative websites who act as either a brokerage or glorified listing service, called into my local networks, sifted through hedge fund managers, etc.  

Tenants pay electric and water (individually metered). 6 Units newly renovated and are rented for $475 each per month.

Was thinking about setting up a simple WordPress booking site, and I’ve downloaded a couple apps like Cozi (literally just downloaded it) and was thinking about setting up individual properties as “family members” etc but... love to hear what’s proven as easy and simple.

I have been doing some reading on a Self Direct IRA for which an individual can take their 401k funds and move to a Self Directed IRA in order to purchase an investment property. 

So if I am reading correct they will also manage the property but it seems that's not included with the HOA fee, it'd just be an extra cost.Knowing all this I'd definitely say this property won't cashflow.