Acceptable procedure for pursuing abandoned property in an estate

[Devin Beverage]

I found an abandoned property while "driving for dollars" and after some research I found out that it's owned/in an estate because the owner must have died. After more research I believe I've found a landline phone number and address of the daughter. I've been looking through the information for probate deals, and from what I've seen this is a little different because it's not technically probate. 

I've seen some back and forth about whether you should call or only send letters to get initial contact with heirs/estate holders (out of privacy or respect I suppose?). What are your feelings? If I've found a phone number, is it fair game? 

Also, and the more important question/request, could you please provide a link or give me a run-through of how such a conversation should be handled? I'm mainly curious about questions like, "How did you get this number/find information about my property?"

Thanks in advance, everyone.