I've seen Jeld-wen come up numerous times.

I've been told from numerous people that the market is hot and how it's a sellers market right now.

The people in BP Nation can comment on the value of a CCIM designation. disclaimer: I don't have a CCIM anything and I am not a licensed broker (although I have done more deals as a principal than the average licensed broker does in sales)

https://www.marcusmillichap.com/-/media/files/research/research%20reports/national%20reports/2017/2017%20mm%20mf%20inv%20forecast.pdf

Local or national is welcomed.  

I think there's kind of this "black-hole" when it comes to being knowledgable on how to build relationships with a banker, and what the difference is between the nationals (wells, bofa, chase, etc.) versus the local credit unions.

By cost I mean properties that don't appreciate relative to the overall national market, expensive marketing to produce such deals or even increased risk by investing out of state.

On the negative: Cost to buy properties is slightly higher than the national average while cost to rent is lower.  

In addition to commercial brokerage I did store development for a national retailer for ten years and can't tell you how much crazy language we saw across the U.S.  

When you say AirBnB you are limiting your marketing options like @John Underwood said.All homes are going to have different occupancy rates throughout the year based on numerous factors.