I’m looking to meet people who are motivated and want to move forward.

I know people that live in Fayetteville, TN and make the drive for example.

The whole point of Airbnb/VRBO is regular people are supposed to be able to rent their places, and those people make mistakes (especially on VRBO's garbage website). 

Tenants probably don't want to get their landlord mad at them and they don't know the people walking through.Ask Seller/Landlord if tenant is current on rent and how much they are paying.

I would look for alternative land options that you could use for RV parking since RV parking at homes is very difficult and people don't use their RVs much, but there are a lot of RVs in Texas.

Estimating construction and remodeling has been around a long time, people who do this are called estimators.There's books, software and even courses on estimating.

The reason for this is you are already being hit for these costs in your payment, so hitting you with the deduction on your returns would be double counting. 

I'm more wondering what people are paying per piece for post cards vs. envelopes.

@Joshua Christensen hit it on the head.Even if CAP rate were meaningful for residential property, what do you intend to do with that information. 

Scott The Book on Flipping Houses,The Book on Estimating ReHab Costshttp://www.biggerpockets.com/flippingbookLocate and attend 3 different local REIA club meetings great place to meet people gather resources and info.