Try this:
Where you want to change from Portrait or Landscape:
Page Layout tab > Section Breaks > Continuous > make your change
At each location, you want a change do this

Thank you.

That, for me anyway, still isn't increassing the page number and always starts with a page 1 instead. And the second issue remains that if I change the orientation or page size the footer and header retains the original size of a 8.5x11 rather than fitting to the new page.