You can use an off-the-shelf eCommerce solution like Shopify, which makes building an online store a quick and easy process. However, it will also mean less customization, as you will need to choose from an existing pool of themes and tools provided by the platform. If you opt to run a dropshipping business, eCommerce solutions like Oberlo will allow you to get the store off the ground and start selling in as little as few hours.
Ecommerce software provides the customer facing front end component of an online business. Online businesses, like all other businesses, need additional software to manage back end functions such as accounting, order management, inventory management, and customer service. Piecing together different software solutions to create a complete ecommerce business platform is complicated, requires frequent maintenance and rarely functions efficiently.
If you are selling physical goods, you'll need to consider how you're going to ship them. PayPal and other processors have worked with shipping merchants, including USPS and UPS, to offer one-stop postage processing. You will also need to research your state laws to determine if you are required to obtain a permit for selling online, or if you need to collect sales tax for your state or municipality.
The only downside in all this is that you somehow need to get your hands on a WordPress site in the first place. And okay, I know this is not particularly a problem for you maybe, but we have to remember that WordPress can be quite confusing to a beginner, and the need to first set up a WordPress site and only then a WooCommerce store is far from intuitive.