You're welcome, also try knocking on a few neighbor's doors, someone knows something.

Get this and see if you can mail to them, knock on their door if in a reasonable proximity, and give them a call once you get their primary address information.

If it's occupied, you might knock on the door and ask about the owners info.  

I'd walk over and knock on his door.

Some filters I am using are tax year (i.e. how many years of taxes are unpaid), property type (single family, multifamily, townhome, etc), tax assessed value, and owner occupied/absentee.Once you have a list you like, you can call them, mail them, knock on their door, etc, depending on what your preferred method is.I hope this helps.  

You are looking to knock on doors of distressed houses and asking neighbors about vacant houses.

The very successful realtors I know do a 4x4 which means they go 4 houses to the right, 4 houses to the left, 4 houses up and down and knock on each door to introduce themselves and tell the neighbors about the open house.

Just starting out you could cold call FSBO/Expireds, Drive for dollars/door knock, and SCOUR craigslist. 

With that said, it may behoove you to be a bit more proactive in your search and prospect for leads via direct mail, cold calling, door knocking, etc.

This will knock off 8 years and save me $100k if I pay for the full 15 years.