Multifamily property management is quite different than single family, I have done both. 

Note: I "can't" change to a different PM.

The big difference?

It is across the street from a park in a family community and we made a difference in that community.  

One thing to remember is that even within a specific market there can be subtle differences in areas.

I see the importance of having a team to help you out, but I don't understand the portion about paying back the loan, how much I should have before investing, if there are anything different if I will be investing from another country as a citizen etc.

I also did a 1031 exchange from a different property that gave me a bunch of cash for one of these purchases. 

@Frankie Lotrec if you have an existing loan on the property and you plan to legally convert from a 4 unit to 5 unit , you should check the loan documents because you’d essentially be converting it to a commercial property, since 5+ units is considered commercial and subject to different appraisal approaches and so it would rule out the property being considered for purchasers utilizing residential financing.  

Gobundance has "microtribes" people can join that have different topics, like multifamily, STR, fatherhood, buying businesses, etc. so people can connect with others that have shared goals. 

I have built a few modular single family homes in Virginia using different manufactures.