Squarespace to Shopify Bookstore Migration

I run a small, independent publishing house and am ready to leave Squarespace behind so our paid ad traffic has a faster, more conversion-friendly destination on Shopify. I need an experienced Shopify... (Budget: $250 - $750 USD, Jobs: eCommerce, HTML, Payment Gateway Integration, Shopify, Shopify Development, Squarespace, Web Design, Website Design)