What sort of things should I be looking out for when hiring such a company?

I went to the Sheriff Sale last month, that was a pretty good eye opener and really sort of put my expectations in check.

There was trash all over , broken furniture , wood and piles of junk ,god know how many piles of dog poop, and an inch thick of dog hair!  

If you care what a Fannie Mae type underwriter will think (ie, you want a 30YF of some sort in the future), put it all on a single line, it's one single property, according to what I think you said.

. - what will you do, if one year after you sold your flip, you are getting sued by the buyer because of some defect or issue, real or imagined, known to you or created by a sub/contractor, or fraud (like, because you made the mistake to advertise your flip for sale with "everything new" and the buyer discovered you didn't change the entire plumbing) and the judge freezes all your bank accounts till things get sorted out?

A corroding pipe that is getting more restricted from grease and hair and all the other crap that aint supposed to go down there that we all know damn well does all the time? 

LLC is the most common, of course, but I think any sort of formal entity will do. 

Thank you Mark - I also saw a lot on google searches explaining that the death benefit was sort of a 'floor'.Since this account has done so well, and is far above the original investments, then the higher value is what we will be getting, vs the lower death benefit.

Grow a little bit of facial hair, put on a nice suit, leverage a team of older experienced people and stop cutting yourself short.

It also has Pittsburgh addresses broken down by ward.It is trivially easy to sum, sort, and filter this data to see the kinds of information you're asking about.