Like I have told many, there are several people who know how to make this work, and you are one of them. 

There are people here who have no problem losing hundreds to thousands in negative cash flow monthly.

Communicating timelines and expectations upfront can help prevent losing good prospects to other properties.I'd say it's a potential red flag if they want to sign the lease without viewing it.

Do you guys ever take the risk of buying a foreclosure at sheriff sale with the previous owner still living in it? How do you calculate rehab cost given you can’t look inside?

Some people don’t want to bother.

I see other people have their primary residence as an LLC however. 

ONLY purchase training if its with funds you can afford to lose because of the failure rate.making connections is important and where success can come from.

Most people selling properties are not professional investors.

Learning that the slower I move, the more money I lose.

Poor people borrow.