If you plan to open your own online store, keep in mind that collecting customer data requires HTTPS. Therefore, make sure to purchase an SSL certificate before launching your website (otherwise, you'll need to redirect HTTP to HTTPS, which can become complicated). You should also consider creating pages for your website's terms of use, privacy policy, and refund policy.
Of course, this does not include the registration documents required for selling products and/or services in your region (country, state, province, etc.).
