Your search base will depend on your domain. If you are: mail.somewhere.org then your search base should be: dc=mail,dc=somewhere,dc=edu.
Your query filter (if its asking for what I believe it is) is what the username is called in Zimbra's LDAP. This is uid.
The search user DN is: uid=zimbra,cn=admins,cn=zimbra
Your Zimbra LDAP password is obtained by running the following command as the Zimbra user: zmlocalconfig -s | grep ldap_root_password
State University of New York at New Paltz