Sample gallery info and text here. Write whaddeva you want! To add photos to the gallery, simply click Edit Page > Edit Gallery > Upload Media. If you want to change the gallery design, you can under settings, though I think this format works well and viewers can click the photos to enlarge them and click through.
If you want to create a new gallery, simply click on page settings (or the wheel icon beside this page in the lefthand dashboard when you click Pages) and click Duplicate Page. From there, you can just input whatever new text and photos you'd like!