This is the front page. This is the first thing the viewer sees. Edit this page to your liking. To add new stuff you can add pages which will show up in the menu on the left kind of like HTCC. If you create posts blog posts, they will act like “newsfeed” items on facebook with the most recent item up top.
When inserting pictures you can do individual photos, or create a gallery. (You get these options when you hit the “Add Media” button on the top when editing.
(Note that you don’t have to upload a file twice. Once it is uploaded you can reuse it elsewhere by selecting Media Library.)
This is what a gallery looks like.