[Zope] default permissions on CMF content?

Hi, I'm creating a Zope site with Plone 0.99. I want news items added in the "Management" folder to be readable only by managers, and "Public" news items to be readable by everyone. I've fixed the permissions on the management folder, but I have two problems: 1. New News Items always get the "Viewable by Anaonymous" security permission. How can I turn that off? 2. How can I filter search results to display only documents which the current user can view? --Noel