Once you successfully create a Card, you'll find a new folder in your local App Data that is scaffolded and ready-to-go for your new Card based on the Type you chose. You can find the location of this folder based on your Operating System:
Or by clicking the Button when viewing the Card page.
The folder generated for your Card will be the same as your
All Cards have a single export point, and in this scaffold it is
index.js. The name of the file isn't important, as long as the
main in your
package.json points to it.
By now, you have a registered Card with a scaffold set-up for the Card Element itself. Now you'll need to add it to one of your Automations to see it in-action.