Then go online and find that areas municipal code and start reading through it.

You do not have to sign a new lease.Establish a free google phone number and tie it to your LLC and ZelleHACC has a change of ownership form that you can download online.

Don't just rely on an online credit/background check!

I've been in that situation before and it sucks.Now, you might feel that your only choices are to either get mistreated while being $3000 lighter, or to take the money and potentially let other people get screwed because you didn't warn them.But there might be a third option if you can convince the business owner that negative reviews can be turned into positive results.Point out that all businesses, even the best ones, make mistakes and receive bad reviews.But the best businesses work with their customers to fix the problem and have the review edited to reflect that.

Does anyone have or recommend any calculators (online or excel) for seeing numbers on rentals, BRRRRs, short-term, etc?

OP Edited his original post, 900/month. 

Try doing it when mortgage rates are 6-8%, NOBODY you know or have ever talked to is doing is, there are no books in the library, no such thing as Bigger pockets, no Zillow, no online MLS, heck maybe no internet.

Are they mostly meeting online?

If there was a team that developed an online game where you could simulate real estate investing, crunch numbers, find properties, and sell and lease homes it would be lucrative.

Just photos or editing etc....My advice is to have them out on a nice sunny day so they don't try to shop in a fake sky.