Create a Map ID:
Go to the Google Cloud Console.
Navigate to the Maps Management page.
Click "Create new Map ID".
Give your Map ID a name and description.
Select the map type (JavaScript, Android, iOS, or Static).
Click "Next".
Create a Map Style:
Go to the "Map Styles" page in the Cloud Console.
Click "Create style".
Choose to either import a JSON style or customize one in the editor.
Customizing in the Editor:
If customizing, select map features and adjust their styling (color, visibility, etc.).
You'll see a preview of the changes on the map.
Map features with custom styles will have a blue dot next to them.
Importing JSON:
If importing JSON, paste your code into the provided field.
You'll see a preview of the style, and if valid, you can click "Customize".
Associating the Style:
After creating or customizing the style, you can associate it with your Map ID.
This allows your map to use the custom style.
Managing Feature Layers:
In the Map Styles page, you can manage feature layers by adding or removing layers.
Click "Save" to apply the changes.
Google API Documentation: https://developers.google.com/maps/documentation/javascript/cloud-customization/map-styles-leg