However, if you have the time and prefer to source properties on your own, I would highly recommend the following strategies:Connect with probate attorneysVisit property auctions: These happen monthly and, surprisingly, aren’t saturated with investors.Cold callingTarget LLC owned properties: Over the years we have seen an influx of companies purchasing SF for rentals/long-term holds and they failed to account for property taxes and an increase in new construction coming to the market.

I’ve used seller financing as both a buyer and a seller and it can make a lot of sense in certain circumstances (for example I used it as a buyer when I reached the maximum number of conventional loans I could get, and I’ve used it as a seller to both increase my net proceeds (due to collecting interest as “the bank” in addition to the sales proceeds) and to lessen my capital gains tax hit by spreading it out over a few years).

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

I know the IRS asks about entity vs personal members and if they're foreign or not specifically on the 1065 and other tax forms. 

Is your DSCR ratio greater than 1-meaning are you cash flowing (according to the lender's criteria of mortgage, property taxes and insurance (and HOA) if applicable).

Compile the list and then run the tax records on them all.

To add to your excellent points, it’s also important to consider the tax implications of a 401k loan.

Did the book provide enough information to get started such as contracts, tax liability information? 

While they are beautiful and get you top dollar, many come with tax abatement that expire in 5 years and will significantly reduce your cash flow once expired. 

Basically all rentals, even ones owned under LLC, come up during loan DD as long as you file them under one tax return as personal, that was what happened to me earlier.