You can also check meetup.com or search Facebook for real estate investment groups, clubs, or meetings in your area.

I do a lot of searching through the MLS and county records, and come across these fairly often, but am curious as to who/what they are.

I don't know exactly for sure, but after I call Airbnb CS and have them search for my listing, I get a booking request in the next day or two. 

You can also find real estate investing groups through meetup.com, Facebook, or a Google search.

I did a search on my own  to help them find it and I can't find any insurance companies offering quotes for the Los Angeles area at the moment.

You can look on websites like https://www.corporatehousingbyowner.com/search/United-States... and https://www.furnishedfinder.com to see what similar houses are rented for.

You know how to do your own Google Search?

Start your search well ahead of closing your sale.  

 I am in search of a spreadsheet to determine the profitability of flipping a house before making an offer to an HML I am new to this process and would appreciate any advice.

Quote from @Otis Clayton: In my search for private money , I have heard there people use SDIRAs to fund real estate investments and be in the first position.I wanted to know what are the pros and cons of using SDIRAs for fund Real estate?