Different markets react differently to various types of mailings (for example letters vs postcards) so I'd recommend trying a few different types of mailing and keep track of your response rate. 

Q3: What kind of direct mailing is most appropriate (postcards/yellow letters/business letters) for the list(s)?

Here are the average response rates we have seen based on our customer feedback as well as our own mailings throughout the years: Yellow Letters- average response rate of 8%-9%, all kinds of calls (angry calls, curious calls, tire-kickers, quality calls)Postcards- average response rate of .5%, mostly quality calls.Zip Letters- average response rate of 2%, mostly quality calls.

When I find them I can always put a postcard or knock on the door, but sometimes there is no one in the house or anything.

I am new to the game, so I am sorry if my question seems naive, but I can't imagine somebody seriously considering selling a home by reading a postcard in the mail.

With this list you I am following 1. small text postcard 2. yellow letter 3. lg text postcard 4. typed letter 5. greeting card 6. zip letter I found this somewhere on BP but I can remember exactly where (would love to give credit) ... mail the list every 4 weeks for 6 months which would be 6 times around.

As a Real Estate Agent, I've put together a postcard, targeting a specific area I plan on farming each month.

But with that being said is 1,000 postcards worth sending or is it worth the extra money to send 2,500 or 3,000?

They know when they receive the same post card on multiple homes that you are farming and not really serious about them.

You can choose to mail letters, postcards, zip letters, ect.