Letters To Home Owners Suggestions?

[Hayes Mercure]

Hey! So after doing a lot of research in the area I'm looking to buy rentals in the south metro Atlanta area, I want to put a lot of focus on handwriting letters to owners of houses that seem rundown or possibly vacant. I like the idea of taking the time to handwrite a short note so I can get as personal as possible about their property, the area, my interest, etc. I've been "driving for dollars" each day before picking my daughter up from school and recording addresses.

A couple of quick questions: 

1) When I do a search on the address with the county assessor's office and the owner's name(s) comes up different than the name and address for the mailing address to the property, what could that mean? A lot of different things? Is that possibly a good sign? 

2) Any suggestions on what to include in the letter? I'm brand new to RE and haven't done this before. Is it best to keep the note short and to-the-point? I do have cash(not hard money) to buy the property and could cover closing costs as well. My plan is to BRRRR these fixer-uppers.

Any advice/guidance would be HIGHLY appreciated! Thank you so much!