You can install the package via composer command line by running this following command.

composer require pingpong/workbench

After the package installed, add Pingpong\Workbench\WorkbenchServiceProvider to your providers array in config/app.php file.

And the last, publish the package's configuration by running:

php artisan vendor:publish

That will publish the workbench.php config file to your config/ folder and you need to set the name and email of package creators on it.

You can autoload the workbench by adding this following command to your bootstrap/autoload.php file. Put this following command at the very bottom of script.

/*
|--------------------------------------------------------------------------
| Register The Workbench Loaders
|--------------------------------------------------------------------------
|
| The Laravel workbench provides a convenient place to develop packages
| when working locally. However we will need to load in the Composer
| auto-load files for the packages so that these can be used here.
|
*/
if (is_dir($workbench = __DIR__.'/../workbench')) {
    Pingpong\Workbench\Starter::start($workbench);
}

Before you create a package, you need to update name and email config value in your config/workbench.php file.

Creating a basic package.

php artisan workbench vendor/package

Creating a package with generating some scaffold resources.

php artisan workbench vendor/package --resources

For more documentation you can visit the official laravel documentation