There is a lot of free information online (CPAs and business attorneys in particular will often talk about the differences between them in blog posts). 

I imagine most buyers do find their house online, but probably an MLS listed house that shows up on all of the search engine.If you aren't in a hurry to sell, give Zillow a couple weeks/month and seen what happens.

The great thing about online is there is transparency.

Someone who responds to an ad on the Internet is an unknown in terms of their character, even though they fill out an application and undergo a background check of some sort.In the past, I would get a discount on a month's rent if I renewed my lease by a certain date.

If I take them to small claims (which I’m sure that’s where this is headed) can they still leave the country if they have court date?

Thanks for those suggestions and date @Chrissy Arnold!

Is it a sheriff sale or online auction?

Essentially what that means, is if you lied on the loan application and at a later date the bank figures that out, you are on the hook.Having said that, you will have a hard time getting a non-recourse on a standard residential property (1-4 unit).

Tenant had bad credit which he explained (540-570); I wanted to rent the apt for the winter so I wrote a 6 month lease and explained we could extend if all goes well (lease dates Dec 1 - Jun 1).

You can also check their reviews online at Google, Facebook, or Yelp.