Big e-commerce website

Shopify is good and easy to use. Magento is very popular for larger stores but you will need to be technically proficient. Whatever you decide to sell, make sure there is demand, it's competitively priced, or it's rare/unique to yourself in that particular market.

Look into SEO (Search Engine Optimization) and ads to get traffic, and make sure the design, grammar and spelling is on point otherwise you look like a scam.