At the law library, look in the index of the Probate Code for Small Estates Without Administration.  Affidavit procedure is listed under that heading.  The information in the Probate Code is probably too general.  If that is the case, look for the same index headings in Pleading and Practice.   Pleading and Practice might have examples of the completed affidavit under forms following the discussion of the affidavit procedure.