I do my own due diligence and call all reference numbers, past landlords, and do an in person interview.

Time in the market > Timing the market

The third option would be to parcel it out in steps.

We're looking at a strategy focused on BRRRR (looking at good markets in SE US like Birmingham, AL), and large land wholesaling. 

You could pull some cash out to do the renovations and then refinance on the ARV once its done in 6 months and take out more cash to buy another investment home or rent that one out and buy a New primary home.If you have any questions on the steps or the process feel free to reach out or send me an email. 

This property has double the price value in 2 years.

There are a few items I have no idea about, I'm hoping someone here has some experience in the field and can provide a ball park means of estimate 3 costs:1.

Requiring a real estate license can potentially be a “trap” for wholesaling, as real estate licensees may in in violation of their code of conduct by way of their wholesaling activities.  

Any time I hear that a tenant has lived in the same rental for 10+ years, I get suspicious.

So you are doing construction in your yard, but not directly connected to the existing structure the tenant lives in and they are already complaining?