Are you using WooCommerce? If so, there is an instruction document in Shopify help center: https://help.shopify.com/en/manual/migrating-to-shopify/shopify-import/woocommerce-migration. Remember to carefully work with your XML or CSV files so that the data will be displayed correspondingly on the target site.
Or you can hire a developer to migrate the data for you. https://www.freelancer.com/ is a good resource to find the one that you need.
Another way is using an automated migration tool. LitExtension is the leading company in this field with 98% positive customer reviews on Trustpilot. Our tool can help migrate almost all of your data including products, customers, and orders between 2 eCommerce platforms automatically, accurately, and securely.
If you want to see how easy it is to switch your store from WordPress to Shopify, I highly recommend you trying out our FREE DEMO with 20 entities limited first.
if you don't have strong coding skills - we wouldn't recommend you migrate your current WooCommerce store data to Shopify manually, because it can possibly result in huge data loss.
Contrastingly, you can turn to the Cart2Cart service and get all your store entities transferred to Shopify in a totally automated manner. There are only 3 steps that set you apart the new Shopify store - connecting the stores (WooCommerce and Shopify), choosing the data you want to migrate and testing FREE Demo migration.
Feel free to contact us and we'll help you replatfrom stress-free.