To sell merchandise on Google, you can sign up for the Google Merchandise Store program, which allows you to create a custom online store and sell products through Google. Here are the steps to getting started:

Sign up for the Google Merchandise Store program by filling out the application form. You will need to provide information about your business and the products you want to sell.

Once your application has been approved, you can set up your store by choosing a design template, uploading product images and descriptions, and setting up payment and shipping options.

Promote your store and products through social media, email marketing, and other channels. You can also use Google Ads to advertise your products to a wider audience.

Monitor your sales and customer feedback, and make any necessary adjustments to your store or product offerings.

Keep in mind that there are fees associated with the Google Merchandise Store program, including a commission on sales and a monthly fee for hosting your store. You will also be responsible for processing and shipping orders, handling customer inquiries and returns, and complying with relevant laws and regulations.