But is one of them better than the other, strictly with respect to the investment method (interest income from private lending)?

The BRRR method might get you returns close to flips but they won't it would probably require you to be more active. 

If I shoot for a 12-15% cash on cash return (using the four square method), is that generally a pretty safe bet?

Well there's always the BRRRR+turnkey method.

As and investor my job is to find a good deal, fix it if necessary, and sell it for a profit (or keep it of course), by using every legal method available to me.  

I've also been thinking about getting into Inspections and/or Appraisal, I know they me decent $$, As long as there's no conflict of Interest, it seems like it'd be a hell of a way to learn some very VERY valuable things about housing and laws, methods, uses, code etc.

As far as tenant is concerned, they have a normal key.2)Old School method: buy new locksets to fully replace at turnover but hang on to the ones you remove.

", he theoretically has some protection, but my (somewhat distant) memory of business law is that the so-called corporate veil (protecting the shareholders of the corporation from personal liability) can be pierced by any number of methods and fraud is one of them.  

This still seems magical to me, as no one has been able to give a clear precise method of making these decisions.

2016- Pay off Truck (COMPLETED)2017- Max out ROTH IRA & build bank roll for first property/Reserves (ON TRACK)         - Attend first RE Meetup (COMPLETE)         - Make offer on a property (COMPLETE, but didn't get accepted)         - Read 2-3 RE books per month and listen to podcasts (ON TRACK).2018- Transition out of the Marine Corps         - Have at least $20K cash to purchase first property         - Transfer to Community College using GI BILL, get my 60 credits, apply to UCLA w/GI BILL.2019- Have my first property using the househacking method