An InDesign document can contain multiple pages, and pages can be arranged in spreads of two or more pages.
The New Document window allows you to specify the number of pages in your document when you create it.
After your document has been created, the Pages palette is your friend. The Pages palette has the ability to:
Adding
and deleting
pages are buttons at the bottom of the Pages palette.
Inserting pages is an item in the options
menu on the Pages palette.
To reorder pages and rearrange spreads, click and drag the pages around.