how do I make a 5 x 7 template

Open a new Blank document.

Click the Document button to open the Document Inspector in the right sidebar.

At the top of the inspector, choose the Paper Size from the second menu.

Adjust Header and Footer positions and the Document Margins, shown toward the bottom o the image.

Look through the other items in that section of the Inspector and make other adjustments as needed.

When done, close the Inspector and Save the resulting Document as a Template.

The template will be saved to your Templates folder, and will appear in the My templates section of the menu in the templates Chooser.

Regards,

Barry