I Have a list of addresses i need to send post cards too. my question is do I print each post card individually with a different address on it or do I print them all at once and put the address on another way?

However you need to send postcards too  

What about a post card instead of a letter?  

I was wondering what the wording looked like on everyone’s postcards?

Yellow letters are industry standard, but, you could try postcards too.

What do you find works best for both situations postcards, yellow letters, notecards or professional looking letters?

I'm doing my first set of postcard mailers.

I then used yellowletters.com to mail the postcards.

A highly educated person may rather read a longer typed letter where a busy house husband/wife may not have the time and a Postcards fits them perfect. 

Cons:-Every late night guru tells all their aspiring real estate investor/wholesaler wannabes to market to these owners, so they are constantly bombarded with marketing-If you arent doing a search to find out if they own multiple properties you could be mailing to another investor—there are several investors here on BP that have talked about the hundreds of postcards, letters and phone calls they get on properties they would never sell at a discount-If the owner doesnt have someone locally who can give you access, getting in to see these properties can be difficult.