You don't have to start every video the same way. The dashboard has five ways in, under Five ways to create, and four of them land you in the Studio composer with a brief you can change before anything renders.
With Describe a vibe you type the mood and the scene in your own words. From a preset opens the Presets page, and picking one drops a ready-made look and sound into the composer for you to adjust. From an image takes your own art and builds the scene and the music around it. From a URL takes a YouTube link and uses it as a style reference for the look and the sound, on Lite and on Plus.
The fifth one goes somewhere else. New series sets up a posting schedule instead of a single video, so Chillframe generates and posts each slot for you. The Series articles cover how that works.
Whichever way you start, you pick the video type and the length yourself before anything renders, and those two decide how much of your usage the video takes. Settings → Usage shows how much you have left. A new Series tells you how much of your monthly usage it would use before you create it.
If you're not sure which video type to pick, Choose a video type, quality and length goes through them. Anything else, email [email protected] and a human will read it.