jtables in netbeans help

I am learning NetBeans and Java for that matter, and have created a JFrame 
and put a JTable in it, and am having a hard time figuring out how to modify 
things in NetBeans - for example, how do I make the column headers show?  I 
see where to edit the text for the headers, but cant figure out how to make 
them show.   I can find sample java code on how to do this, but I am trying 
to figure out the 'NetBeans' way of doing it.

Also, I am trying to figure out how to modify the JTable column sizes 
graphically in NetBeans...

It would be nice if there was a site with various mini tutorials on how to 
do these things....