Before beginning, it's worth noting that for either of these methods to work, the app you are using must support storing files in iCloud. Apps like Pages, Keynote, Numbers, and many third party apps have support for iCloud document storage. Just make sure that before you try and save a document to iCloud, the app or program you're using supports it.
For Mac Mavericks mavens. iCloud is wonderful, but finding your documents can be a pain.