Starting your journey as a new online seller is exciting—but the way you set up your eCommerce accounts can determine how fast you grow (or how quickly you get stuck). Whether you’re launching on marketplaces like Amazon, eBay, Etsy, or building your own store with Shopify or WooCommerce, proper account setup isn’t just a formality—it’s your foundation. This Marketplace Seller Launch Guide will help you build that foundation the right way from day one.