Please check out the following tutorial and user's guide:
http://www.netbeans.org/kb/articles/mysql-client.html
http://www.netbeans.org/kb/50/using-netbeans/dbconn.html
Regarding dbquery and qbreport, these are external tools and i think NetBeans does not provide direct support for these. In general though any JavaBeans component can be added to the GUI palette as described in:
http://wiki.netbeans.org/wiki/view/FaqFormUsingCustomComponent