Google shopping is helpful tool to get more sales for your products. You can upload your products to google shopping from shopify easily. Here you can find a brief overview how to upload your products to google shopping from shopify store. You need a Google Merchant account and Google Adwords account to add and show your products on google shopping. Once you have these accounts created, you need to choose a shopify app which creates google shopping feed. There are some free and paid apps on shopify to create google shopping feed e.g. Google Shopping developed by Shopify or Google Shopping Feed Developed by Simprosys InfoMedia.
Link with Merchant account and complete Product data specifications
Once you have installed such kind of app on your shopify store, then you just need to link your merchant account with the app. You can make the other setting like shipping information, target country, currency, language etc. You can find this information along with screenshots on the apps page on Shopify. Also, your products should complete the Product data specifications by google to get them approved on google shopping. Once you complete this information, you can upload your products to google shopping.
Create Shopping Campaigns in Adwords
Once you have uploaded your products feed to google merchant center and after their approval, you have to create shopping campaigns from your Google Adwords account. Until an adwords campaign is created, only you can see your products on google shopping. You can set your budget in adwords campaigns as per your requirements and your products will start showing in shopping ads until the campaign is live.