How to I contact a distressed home

[Will Eagles]

So I have been driving my target area a lot on marking properties that are distressed and/or vacant that would be great to rehab. My question is how do I approach it from here? Mailer? Flyer? Phone call? I know calling or knocking is probably the last way since they may not like me asking to buy their house. Does anyone have a flyer template that seems to work well? Is that my best course of action?