I use pages on my iPad for documents. Apple says that I can have everything that is in Pages on my iPad shared on my iPhone using iCloud.
How do I configure that?
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In addition, you may find this how-to resource helpful in setting up iCloud.
In addition to bassplayer7's list, if you want to sync to a Mac, you would need OS X 10.8.
I use iCloud syncing between my Mac, iPad and iPhone for all three iWork programs. As a professional who frequently presents at conferences, I rely on iCloud to always have the latest version of my presentations, quoting system and forms on my gear.
Before you go hog-wild and build everything on your Mac, start out with a test file with the fonts and formatting you want use and ensure cross-device compatibility. iOS has a subset of Mac fonts available.