I'll try my best to put this in the most simplest way,
Im trying to create a magazine, but I'm finding it difficult to make a double page spread without splitting it in half and putting it on different pages?
Is it possible to set the pages up so they are side by side, and then change them to the right order to print?
Just set them up as letter size pages in reader order. If you are having it printed professionally, send it as a pdf with separate pages, and the printer will handle setting up the printer spreads. If you are printing it from an office printer, both InDesign and Acrobat have Print Booklet functions. Many office printers also have this capability built in.