I accepted a prospective tenant's lease and deposit after doing due diligence.

It's super easy and runs via the app or keypad. https://simplisafe.com/From the website - "Without Wi-Fi, you can still change your system and sensors’ basic settings via the Keypad as well as take advantage of our Professional Monitoring service’s basic features.

What started out with 2 honest and trustworthy professionals ended with both accepting negotiated prison sentences. 

I'm new to the website.

If money in the pocket is not really the interest, then 100% seller financing may be acceptable to Seller; but maybe not if Seller wants money in the pocket.

As you begin your investing journey I would suggest looking at a good resource like this website to just get a good idea of different areas. https://www.areavibes.com/Its a great resource and starting point

There's a website called Furnished Finder that traveling nurses use a lot, it is also for anyone looking to relocate or who needs an interim solution.

Most managers are on just these sites and perhaps their direct websites, but the others are realistically the primary source. 

I had a professional photographer shoot the listing photos and the place where it was advertised is the main website out there, and my photos were one of a few professionally shot listings.

Did you create the website yourself?