Just because the cover is Disney doesn't mean it can't be used for other reasons. A Year at School, Special Friends, Vacation, Relatives, Awards, etc. It can cover a short time period (I just did one of my child's play) or a long period (I have one that will never be finished, each year I add 4 pages of that year's Christmas) That's the fun of scrapbooking -- no real rules, it's what you want it to be!
A scrapbook usually has pictures displayed in fun ways, but also putting your thoughts about the picture/page/event is important as well. If you go to your local Dollar Tree or Craft store you can get fun scissors and glues to jazz up your work.
Check out some of the weekly challenges and you can get a good idea of what people do with their books!
Have fun!