You can read Help, which is under View > Extensions > Vegasaur > Help menu.
But bear in mind that it won’t type the text for you, it will generate text events from your text.
Two ways:
1) The following options (Options > Preferences > Editing tab) can help you: New still image length – set it BEFORE adding images to timeline. Automatically crop still images added to timeline will crop the image so its size will completely fill the preview area. Aspect ratio depends on the project settings, so if your project is 16:9, they will be cropped exactly as you want.
2) Third-party extensions can save you many hours of editing.