IMO, the person you want to look at is Jonathon Haveles with Land Riches Blueprint. 

If you decide to move into one of the units, that could help with your personal expenses and ease some of the pressure, but ensure you account for all the fixed and variable costs in your projections.4.

I never had that come into effect on my single family home purchases since I never wanted to personally be on the hook for such a high mortgage, but I think it might come into play for an MFH. 

So my questions are:Do I write an addendum to the lease with just one person?

I’m ready to start investing in my personal life to achieve that financial freedom! 

What do you file for this "income overseas," do you file SChedule C self employed on your personal 1040 tax returns ?

For the LLC, talk to an attorney and your tax person.

Bogleheads was the source of most of my formative personal finance education (for ~14 years), and it’s relevant because the SWR discussions there are typically in the 2-4% range.

Usually this comes down to personal goals and preferences.

I just completed a private lending deal where I borrowed at 10% on an investment property LOC and at 7.9% on a personal loan.