Go to Orders > Retail Store Setup to know what you need to set up your online store.
Yes! You can import products by going to Products- > CSV Import.
This will require creating a product type and a gift card product. To create the gift card product, go to Orders > Retail Store Setup > Gift Cards. Click the option, "Yes, the store will offer gift cards". Once the product is created, you are encouraged to do the following in Products->Products: Add an image, Create a detailed description with the terms of use of the card and Limit payment methods that can be used to purchase a gift card to credit cards or ACH.