Only read those from the past couple years, Dodd-Frank had changes so comments prior may not be applicable.

Any cautions or red flags I need to watch out for? 

For example Real Property Management charges a $200 fee to the tenant to write a lease on top of $49 per applicant.

What documentation is required, for you as a Hard Money Lender, to determine a property's ARV or FMV (for LTV Lenders), for the applicable loan amount?

I’ve filled out some refinance applications and have found out that with the increase in value of the property over the last few years among other factors, I am able to get about $40,000 - $50,000.

I'd definitely like to stay connected and watch your progress.

Landlord would treat applicant fairly like anyone else.

I ask applicants as I've found many have no problem telecommuting or arranging their schedule around repairs if needed, and some actually prefer it that way.  

Here is a video on 'Driving for Dollars' https://www.youtube.com/watch?

When the writing on the wall is "this is a great investment option" and people start flocking to it then it is time to pull back and watch the fun.