As you begin your site within a site or mini-website, you will want to choose a theme and or color scheme. You should keep your pages consistent. Find a set of starter pages and stick with that set to maintain a consistent look and feel to your pages. If you are creating pages for more than one school you may choose a second Starter Page set.
Click on the New Page button in the upper lever of the Contribute window. Here you will find a series of files that are available to you. You may pick and choose and alter the pages to fit your needs but you always need to keep in mind that you want all of your pages within your site to have a similar color scheme, consistent navigation and a good flow.
Look in the preview window to see what each theme looks like.
Example of Preview Window:

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