The 4pm to midnight shift would be the better one to quit in terms of meeting most clients' time availability.I have to admit that I'm a bit disturbed about the phrase "trying my luck selling some homes".  

Now, I need your help to ask the right questions to figure out how to make it a GREAT deal (thanks for that phrase @Brandon Turner!)

Even in very exacting jobs (e.g. space craft design), where even a small mistake is literally a mission critical life & death issue, they use 'rules' to avoid over-engineering (or to use another phrase 'analysis paralysis').The 'rules' for real estate investing are not intended to be exact or fully comprehensive.

If you do not, this sounds like a potentially very rough way to learn about them.To me the key phrase in your post is "they can't get a loan because of their credit score".

My thought process is to always protect my assets on the front end because that phrase "you never know" can be very costly if something happens and your tenant sues you.

Black cops turned up, even the complaint we made at the local Deputy post was made to a black woman who seemed utterly uninterested, just repeated a well used phrase "it's free speech, sir". 

I would talk with your next property manager and agree upon a clause that would allow you to be released, or have the option of release if the property is not rented within a certain time phrase.

Specifically my sign says I WANT YOUR HOUSE followed by a catch phrase like any condition, or cash in hand for example and my number.

It's all about wholesaling and rehabbing and they often phrase and ask things in terms of a beginner.  

I phrase the conversation as others have said, above, so despite the fact we have an appointment, they need to "opt in" with a call/text confirmation at least 2 hours beforehand or it's as if we never crossed paths.Another thing that helps is double-booking (or more) the appointments (this also helps with perceived scarcity of resources and prompts more ambivalent applicants to make a move to "beat" their competitor.")