Google Sites is available from your personal or school gmail account
Learn how to use Google Sites from Sites Help
Getting Started and Setting Up a Blank Template-Pages in Google Sites
Log into your gmail account and select the Google Apps "Waffle" in the upper right hand corner.
Select Google Sites
Select Create in New Sites
Add pages by selecting Pages in upper right hand corner and then + sign at bottom of page --New pages will automatically populate in top menu. You can drag the pages into the order you want them to appear.
Insert allows you to add text, images, videos, docs, slides......
Google autosaves as you are working. To Preview--select the eye icon. To Publish -- select the Publish Icon.