Really, real estate investing is far too intricate to be broken down by a bunch of rules.

That and most renters there are extremely transient, so that can make for a lot of vacancy and a specific dynamic in the renter pool. 

Ive started to set up a facebook page and even that is proving to be more intricate than I thought but I know that could help tremendously. 

Also very important is dynamic pricing that meets supply and demand to maximize earnings.

I mean my first house I bought in Palo alto I paid 180k for it.. probably worth 2.5 to 3 million today.. tell me what SFR you could have bought were you live and would have been about 300 negative had I rented it at the time and then over time because of the strength of appreciation markets rents went from 1,500 to 5 thousand.. you just don't see those dynamics in the quote in quote cash flow markets .. rents are stable have been for the 20 years I have been funding them and prices while they have gone up and down and maybe % wise not bad but if you have 20% appreciation and its a 50k house it went up a whopping 10KSo that's my point.. 

I use the Turo suggested dynamic pricing.

The remainder of places are surveyed annually.Using data from the BPS, investors can get an idea of the supply and demand dynamics within their market.

Toward the end of this year I bought my office building and renovated it for 35k upside equity value from purchase price , hired a full time in office worker and set up intricate systems and processes for incoming leads.

ARV, Closing costs, rehab cost, taxes, etc... are all very dynamic numbers.

The following is an excellent link and goes into the dynamics of inflation.