Basic AS3 Tutorial
From FDT Documentation
Beginning with FDT4, creating AS3 projects has never been easier. FDT 4 now features powerful template management that are designed to help developers get up and running in a flash.
If you haven't installed and created your workspace yet, check out the Installing and Running FDT tutorial to guide you through the process.
Once you have FDT open, you have a few different ways of creating a new project. You can click "Create new Flash Project" via the Welcome Screen, right click in the Flash Explorer and choose 'New Flash Project' or choose 'New Flash Project' from the 'File>New menu' ( OSX ). Right away you'll see FDT's new Project Template Wizard open.