These are fantastic methods that I never would have thought of, especially the hard money lender method.

Everyone has the right to protect themselves and a gun may be the most effective method, particularly for smaller, weaker people.

DSCR is often selected for the BRRRR method because it flexible seasoning.

this is old  tried and true method of simply having you pay them to get credit cards .. there is no need to pay for this service.. unless you want to of course.. there is no magic bullet ut there that is going to give you credit and financing unless you actually qualify for it.But zero interest credit cards are used by some to do rehab and then pay them off issue is though your fico score drops like a rock the second you take on all these CC.Also starting out there is zero chance of getting any kind of business line of Credit that is unsecured.

Find the solution that is the EASIEST TO OPERATE for your guests. 

The easiest way to check abandonment is to verify if the property is vacant and if the taxes are current or delinquent.

If I go with the BRRR strategy would love to hear some tips on how to successfully manage the rehab remotely. if you have money you could potentially lose to learn quicker start with the BRRRR method.

This is technically a method of buying/selling real estate, which is illegal without a real estate or law license. 

That is going to be a great start for you, and househacking is the best and easiest way to get started IMO.

This method allows you to take some of the profit tax free and indefinitely defer the rest of tax, using it to purchase larger, nicer property/properties in areas with better cash flow potential.