Common fees will include a set-up fee, a leasing fee for each turnover or a lease renewal fee, marking up maintenance, retaining late fees, and more.

FHA inspection, in my experience, will primarily look at safety oriented things, including chipping paint, exposed woods, hand railings, properly fitted windows, etc. 

Understanding the nuances of the "A to B, B to C" close, the contracts including assignments, what types of financing one can get for each property, etc.

It's a split level that I bought in original condition, including a 1984 ancient-looking air conditioner and all the things that come with a house of this nature.The plan was to do a full cosmetic + replace HVAC and Roof + prune back 60ft tall pine trees AND turn it into a house hack bnb.What I've learned so far....- Trust but VERIFY everything on the buy side.

All our rental units, including our small units, have tanked water heaters.  

Some of those include Liability. 

As far as negotiating furniture, I would include “furnishings negotiable” or “comes furnished” in a contract.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases.

What could I expect to cash flow per year including on and off season?

People want flexibility, mobility, convenience, and automation...including residents, not just travelers.