When you create document, check Facing Pages from New Document window. Afterwards you can change that from File>Document Setup.
If you have only two pages and you want them to be side by side,
1. open Window>Pages panel,
2. uncheck Allow Document pages to Shuffle from panelmenu (to open panelmenu click little icon in top right corner of panel window)
3. drag thumbnail of page 2 up as long as it docks to thumbnail of page 1. After that they will be together in your layout pasteboard as well.
InDesign always starts a facing pages document with a single right page 1 by default. Another way to deal with this is to open the section and numbering options and change the start number to anything even, but this will be reflected in any automatic page numbering you apply later in the document.
Keep in mind, though, that there is a logical reason for the default behavior. When bound, the document presents itself to the reader first as a single page (usually the front cover or the half-title page in a book), and they don't see a spread until they open the document. What sort of document are you making?
Or make a new single page document, with the facing pages turned off and make the width of your document size the size of the double page spread.
If you are doing this, make sure that type that spans the two pages is separated a little more than needed, this is to cope with the part of the page lost to the spine and to the fold.
If you don't feel comfortable doing this, then make sure you ask the printers to account for creep when imposing the pages.
Hope that helps.
GREAT. Perfect, thanks everyone for all the help!
This is going to be annoying, and I'm sorry, but now that I've got it as a two/double page spread like this, can I make it default to this?
You can set up a double facing-page layout and save it as a document preset for future use.
You can also create a template with facing pages, special page objects, master page stuff, multiple master pages etc; paragraph, character, and object styles. Saved as a template (.indt) file, it opens as untitled, ready for use.