As far as the process goes, I would recommend starting with J Scott's book on estimating rehab costs: https://www.biggerpockets.com/store/flipping-estimating-physical

The property also had a rather bad reputation in Wausau, so finding decent tenants once the physical property was improved would have been a challenge as well. 

Also, look at economic vacancy, not just physical vacancy.

Not everyone will agree with this recommendation, but I physically go visit the neighborhoods where I invest.  

The app, background check, and getting security deposit & first month rent does not require you to be physically there. 

My primary job is as a project engineer, and I do this daily with suppliers and clients worldwide.2) Fly in early in September/October to be physically present. 

Very physical and non-stop, but knowing we are hitting it hard for 3ish years will give us comfort. 100 times less stress than picky, greedy, can't make up their mind, wanting 10 changes a week, but not wanting to pay for it customers.

Physical damage to the property can make it worse but even then they can blame someone else.John Corey

You're going to have to physically split the utilities between the two units.

As mentioned I had multiple health issues that resulted in 2 surgeries and months of bed rest and physical therapy.