But I initially treated like a regular issue. expensive move.

Ordinary income tax rate - when I did several in one year they were considered inventory and taxed at regular income tax rate instead of capital gains.If you are coming up on owning the house for a year, you might be eligible for long term capital gain, which might be the lowest rate of them all.

@Jose CastilloI'd probably start out with yellow letters as I think postcards will get lumped in with the junk mail and yellow letters in envelopes will be put outside of the junk mail with the other regular mail.

I would either do a lease purchase option or just get regular financing and get the seller out of the deal from the start.

@Audrick Brown IVYellow letters come from a company called YellowLetters.It's supposed to look like someone sent a handwritten letter on a yellow note pad.You can always make your own handwritten letters on regular stationary.

The wifi hotspot will ONLY be for the IOT devices and not be used for tenant's regular internet.

We wasted months on our first rehab, trying to do all the work ourselves after our regular jobs.

If I had actually used the credit cards to charge anything (thus getting points or miles or cash back or whatever), then those charges were subject to the regular interest rate. 

Yes, they will be more expensive than your regular maintenance person, but again those will be rare.

What can go wrong here, aside from the things that can go wrong with a regular rental to a family?