The place to start a Word document is the Microsoft Office Button.
Once you press the button, a menu appears. You may notice that this menu, shown here, looks a bit similar to the File menus in previous versions of Word. On the left of the menu, you see all the commands to work with a file. Here's where to create a new document or open an existing one. You've got your Save and Save as commands here, too.
The right side of the menu lists your recently opened documents. These are always conveniently visible so that you don't have to search your computer for a document you frequently work on.