rotatable bonds question, using autodock

 Forgive my basic chemistry questions...  I am planning to dock various
 small molecules to a protein using Autodock.  Some of my small molecules
 have structures such that I am not sure how to assign certain bonds...
 rotatable or not (e.g., partial double-bond character or not).
 Specifically, my questions are:
 1.  In a structure with -N-C-N-  would there be partial double-bond
 character to both C-N bonds, or only one (like a peptide bond)?
 2.  In a structure with -N-C-N- would there be a partial double-bond
 character to the N-C and C=S bonds, or not?
 Thanks in advance for your help.
         Susan Heffron
 Dept. of Physiology and Biophysics
 University of California, Irvine
  Irvine, CA  92697-4560   U.S.A.
     phone:  (949) 824-4625
     FAX:    (949) 824-8540