My wife and I are realtors and I consider that a pretty simple career to fuel my investments that also gives me a sense of time freedom so we can spend as much time with our kids.  

It is great to hear that you plan to start your Nashville real estate career with house hacking.

The home field advantage in real estate is huge, it will make up for a LOT of other factors. 

Quads on a septic system is going to be a major expense and you should expect to pump it out every 2 years or so, so it needs a man hole cover.If it is going to be septic be SURE you have sufficient soil quality for your drain field, you will want lots of sand.

Definitely think a coach is necessary for a consistent career!

CCIM and SIOR are good options, but they require a level of portfolio requirements to receive the designations that you won't have until you get immersed in the business yourself.Ultimately, what you need more than knowledge to succeed in this this business, is the willingness to have hundreds of conversations weekly with people you don't already know, and to do that every week for the rest of your career.

The idea is that, I do this type of work all the time anyway via my firm and I have an advantage in this field due to me working in the industry and being knowledgeable in this subject.

I don't mind fielding the calls as I don't get many.

I worked in Management for 10 years out of college, and the last 2 years of my Management career I was working as a part time Realtor, building the foundation for my career before jumping in full time. 

I've had a few like that in my erstwhile career.