Are you familiar with yellow letters?
Just get a yellow legal pad and some red pens. You can look up the name and mailing addresses for these homeowners on your local assessor site. For each of these properties you found, write a letter something like what follows:
Dear "seller",
I am interested in purchasing your house at "address".
If you are interested in selling, please give me a call at "Your Phone Number".
Camillia
Hand address the envelopes and the return address. If you want to take it a step further, set up a Google Voice and a PO Box. Use Google Voice to screen the calls and the PO Box will be what you use as the return address. That should get you going. Once you start getting calls, you want to screen these individuals for motivation. Finding out WHY these folks called you back and are looking to sell is the most important aspect of the whole process.
Sean Terry has some excellent podcasts on wholesaling that covers everything you could want, including direct mail and screening sellers for motivation.