I send these folks a post card through click2mail or a hand written letter introducing myself and asking if they would be interested in selling their house to me.

I have had a better response rate with yellow letters and post cards it's a much more personalized form of targeted marketing.

Whether its yellow letter or postcard mailings, bandit signs, etc...there IS cost involved.

It is NOT how much the home could be cleanly sold for.Regarding your plan of action right now, you have a few options:Initiate a direct mail campaign, i.e. yellow letters, typed letters or postcards.

Maybe I'm searching BP with the wrong words but I can't find any articles or posts on how to create the actual design for a post card mailer that I can upload to a mass mailer site.Are you creating the post card from scratch in a word document?

Should I send a post card or yellow letter directly to the owner?

It takes at least $500/mo in direct marketing costs mailing letters / post cards.  

Once you get all the potential leads then you can mail each of them. ( Usually postcard works best, make sure it uses key words like "we buy houses" "SELL FAST") have a phone number on their that people can reach you at.4.) 

I took down the mailing address and thinking of sending them a postcard asking about the house, is this a good move since the house is in a new area?

We do write letters, postcards, and some stuff like that.