First and foremost, begin the process by selecting photos on the theme, idea, or event you've decided to work on. Perhaps you want to showcase a certain vacation or your child's first birthday celebration. Or maybe you want to create a scrapbook for a friend or family member. During the creation process, plan on using your photos as a narration of the theme.
Most scrapbook layouts are created in a double page spread, meaning that as you open the book, the pages on the left and right are likely to match in theme and color.
On each scrapbook page you may want to fit three or four photos because when you crowd a page, the result is not always pleasing to the eye. If your photo ideas are not going to work with the double page layout, then you can alternatively create single page layouts. You'll get a feel for this the more often you scrapbook.
Regardless of how many photos you use, keep in mind that the photos ought to go with the theme. Once you have successfully selected a suitable theme, work with the photos and do not be afraid to edit until you find the perfect match. Also keep in mind there really is no right or wrong when it comes to scrapbooking made easy, as you can simply do what feels right for you.