You can select templates in a number of ways. If your Flash always shows the starting splash screen when you open it, there's already a list of templates in the right-hand column, with a "More" button that lets you browse even more.
If you don't have that screen, then from the main Flash menu click File-->New.... The new document window will have a tab that says "Templates" with all the styles of templates categorized. Just pick one, and get started.


