Contacting Owners For Purchase??

[Jordan James]

This may be a stupid question, so I apologize if it is.. 

I'm a new aspiring wholesaler in central Ohio. I finally decided to apply what I've been learning about, gassed up, and got to to know a neighborhood a little better. In the process, I found a few houses that could very likely be good for investing. After locating a few properties, I used the county auditor to locate the owners. And that is where I'm stuck... 

Do I contact the owner through the snail mail address that is listed? Do I go further and find a phone number through Intelius or some other way (if there is a  listed one)? Either way, what do I say to get their attention in a positive way?