Step 1: Click Blank Project.
Step 2: Click on your desired aspect ratio- Landscape, Square, or Portrait.
Step 3: Click CONFIRM.
Step 4: A good place to start is adding an audio file. Click the blue + icon.
If there is any chance you want to use captions in your video see this article: How To Add Audio And Captions With The Blank Project Editor
If you do not want to use captions see this article: How To Add Audio Without Captions With The Blank Project Editor