If you’re basing a digital magazine article on an existing print article, creating a new document is usually the easiest approach. To repurpose a document, you can change settings in the Document Setup dialog box. Specify a page size (such as 1024 x 768 for the iPad SD) and orientation (portrait or landscape). For dual-orientation folios in which customers can view content either horizontally or vertically, you can create two separate documents for each article—one portrait and one landscape. If you’re using InDesign CS6, you can also create alternate layouts within the same document.
Do not use facing pages in your source documents—use only one page per spread.