In Pages the first page of all my documents show the pages user guide. How can I reinstate my documents. They are still on my iPhone

Help Please! All my numerous documents in Pages have recently altered, so that there are no contents other than the face page, which is the Pages User Guide page. Ie Showing the pen and ink bottle. I think this was brought about by me trying to see if I could print the Guide Pages!!! (To no avail)!

Please. How can I reinstate my documents? They are still showing ok on my iPhone.