Then, you can assess if what you have to do is worth your time."

If you're going to go whole hog with several dozen a year as a business, it would probably make sense to have your own brokerage. 

I would encourage him to take a lot of time to assess, take small risks at first, and learn as much as he can along the way.

If you charge market with a few reviews, why would I choose your unit over similar priced unit that has dozens of reviews?  

Dozens of posts and apparently you and I are the only ones thinking this. 

It sounds like the plumber took advantage of the situation. second… Many property managers wouldn’t know much difference between a hammer or a screwdriver so expecting them to go assess the situation is not practical.

Would you agree with this assessment?

The IRS has said, since 2017, that the improvement ratio or $ value is what your taxes are assessed as, unless you have a really compelling reason to use a different value. 

Do I consider it as an SFH and assess potential rental income based on SFH?

These questions will help you assess their experience and reliability.