Typically we see a non refundable deposit and extension fees to keep the property tied up.

On this forum search screening,  deposits, utilities.

Too many gurus make it seem like someone will have instant success and when they don't here comes the upsell.

It can be a looooong process here compared to states like AZ, with your deposit being held for more than 6 months, so you have to understand the process.

After this tenant leaves, you must clean/repair, market, screen applicants, select an applicant, collect the deposit and rent, get them moved in, etc.

All that's due is the security deposit, for you to return as long as no damages to the property. 

Most legal disputes are over security deposits and for small amounts.

. - Make sure you get a security deposit and perhaps do a surprise inspection of their current home.S8 requires an inspection (mostly health & safety) before approving a lease and then annually thereafter. - Not something most landlords taking care of their properties have to worry about.There are limits to clauses they allow in your lease.

As for me, if I were back to square one, knowing what I now know, I would instantly spend the money again for the program we invested in. 

The vast majority of lawsuits against Landlords are for wrongful eviction, security deposit disputes, and Fair Housing Violations.