leads captured from: D4D$, birddogs, networking, (most important)leads broken down into lists: mail sequences, follow ups, drip campaigns, postcards seq, letter seq.

I sent out 1,109 postcards in 2 batches.  

I would send a postcard, but turn it on the side so that they have to spend an extra 2-3 seconds to read it.

Will:Without a doubt anything directly related to the day-to-day operation of your business, such as sending post cards, is deductible. 

Each campaign has a separate number so tracking can be easier. 2 post card campaigns, each has a separate number to check which campaign is more effective. 1 number for ppc campaign to check its effectiveness. 2 lead propeller websites with a separate number for better tracking and one generic website having its own number.

I'm also looking into the yellow post card strategy.

Between short letters, postcards, and bandit signs which would be the most efficient to begin my campaign with?

I've had a lot of people call me back and say I'm one of 20 letters/postcards they received. 

A service to send hand written postcards like Thanks.io.

I'm currently utilizing the same marketing technique (post cards to absentee owners via Click2Mail), and I'm still getting calls and potential leads.