prequalifing phone scripts for 800 # voicmails

I am trying to find a phone script for my 800 #'s voicemail that i could use to help me prequalify my leads that call in off of my ads. I have been dealing with many unmotivated sellers and i believe that this would greatly help increase the time i spend with each lead. If anyone has any info or ideas it would be greatly appreciated.

i believe ron le grand had one in his lease-option course.