ryry,
It's not often that I would be tempted to add anything to Dennis's expert advice, but here goes. You asked about choosing to have no Headers and Footers.
From the View Menu, select Show Layout (if you haven't already done that) so that you can see what's happening. If you have Headers and Footers selected, you should now be able to see them.
Next, in the Page Inspector > Document Tab, Document Margins pane, uncheck the Headers and Footers Check Boxes.
You can adjust your document margins to suit your 5 X 8 note cards while you're in that part of the Inspector.
Regards,
jerry