After registering and setting up your developer account, you can submit your extension to the Chrome Web Store. But before you do so, there are a few ways to prepare your extension and other content before submitting your item.
Test your extension in production
Load your extension locally and make sure all your features work as intended before uploading your extension to the Chrome Web Store.
Review your manifest
After uploading your item, you won't be able to edit the metadata of your manifest in the developer dashboard. This means, that if you notice a typo, you will have to edit the manifest, increase the version number, and zip the files all over again.
Make sure you check and include the following fields: