In person is better than over the phone if possible, as I have been told by annoyed or lazy clerks "NO STR allowed" as that was the easy button to get me off the phone, or if they are anti STR. 

Thank you,KVBelow are my answers to some of your questions that I feel qualified enough to answer and then some of my personal thoughts on where to go from here."

Personally, if I were to sell the stock, I would buy more property, not pay off the existing one. 

For example, at the start, do you confirm if all persons in the house are aware of your presence, and do you ask if it is OK for you to open bedroom, bathroom and closet doors?

I personally haven't sent postcards, I've had good luck with PPC and Video ads. 

@Matt Solis would be the perfect person to speak to about this!

If you haven't connected with local people in your market there are several methods here.  

But, you need to talk directly to the person whose name is on title. 

@Treza Edwards "I am reading the Rental Property Investing book and implementing the method that focuses on cash flow and that strategy states you need to have $300 cash flow per month, per property.

I personally would avoid over investing in this unit.