There are a number of WooCommerce store themes that you can choose from. For this tutorial, I am using the free WooCommerce Storefront Theme.
Once you have downloaded that theme (or any other WooCommerce store theme of your choice), you can head back over to your WordPress admin area.
Click on the “Appearance” tab in the left-hand menu and then on “Themes”:
Then click on the “Upload” button at the top of the next screen:
You can then click on the “choose file” button and select the Storefront zip file from its location on your computer:
After the theme is uploaded, you can then activate it. Visit your website home page and click refresh in your browser. You should now see your new theme installed.