Yes, you can. Go to the "Basic Details" tab and change the page orientation in the page configuration.
No, watermarks aren’t supported in the simple template. You can use the Google Doc template for this feature, as it’s more advanced.
Yes, you can adjust the page size, orientation, and margins in the page configuration.
Template defaults are used to create documents with a single click for the selected template by creating a new button.
Not yet, but this feature is planned for future updates.
Yes, you can insert a page break using the toolbar or by pressing Ctrl+Enter (Command+Return on Mac).
Yes, formatting will be the same in PDF and DOC formats.
You can add them through the "Header" and "Footer" tabs.