Platform you are using would probably help you get more traction in terms of answers.. magento? bigcommerce? woo commerce? shopify?

Hi you,
what is your product you want to create shopping campaign in Google ad-words?

First you have to research your niche to understand what platform is suitable for you. Is it Google Adwords or other media like Facebook. Then you can consult with somebody to manage the Google Adwords shopping campaign. You can search for them on Google.

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I can advise working only with experienced specialists. Budget blow can occur 9 out of 10, that's why saving money is not always good.