Direct Mail Respone and Initial Interview Questions

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Hi BP, I am an investor in the Allentown, PA area and am just starting a direct mail campaign. I've listened to many of the BP Podcasts and have heard so much good information on so many topics that it's been hard to retain it all. 

Now it's time to put my knowledge to the test and I'm drawing a blank.  Specifically, I'm looking for the best initial interview questions when taking phone calls from motivated sellers (or just plain weirdos) who are responding to my direct mail marketing campaign.   Any suggestions from the experienced here at BP is much appreciated.