Custom Online Store Development

I’m planning to launch a brand-new online store that lets customers browse, add to cart, and securely purchase my products. The site needs to be built from the ground up, starting with a clean, modern design and ending with a fully functional checkout flow... (Budget: $250 - $750 USD, Jobs: eCommerce, HTML, Payment Gateway Integration, PHP, SEO, UI / User Interface, Web Development, Website Design)