Cheap Impostor is an inexpensive "Imposition" application. Without imposition software the simplest way to transform your document into a magazine would be to use a photo-copier to shrink the pages so two fit sideways on a sheet of paper and reorder them so that when a stack of them is stapled and folded in half the pages appear in the correct order

The short story is that Cheap Impostor lets you skip the photocopier step and produce output from your printer that can directly be turned into a magazine. Further, Cheap Impostor has settings that let you create books with multiple signatures