If you haven't actually created the local accounts yet, then an easy way would be to create a template user, and set that user up exactly as you want (dock, favorites & bookmarks, etc). Then, from the Terminal (you'll need to use sudo), copy the files of the template user over the existing /System/Library/User Template/English.lproj. This will set the template user as you desire. As you then add accounts, they'll all get the initial setup that you have created from the template.