Launching a website without registering a company as private limited

I am working on early tech start-up and building an online product. Before registering a company as a private limited, I want to launch my product (online classified website) and validate the business idea. Could you please clarify my below questions? 1. Can we run a online platform (website) and provide free services without registering a company? 2. Are there any issues in collecting the customers information without registering a company? The customers will be providing their email address, phone number, name, upload product photos in our website which will be saved securely in the database (AWS). 3.Can we include terms/conditions and privacy policies in our website without a company name? 4.Can we register a brand name(trademark) under individual name time being to safeguard the brand name? 5. Will there be any other legal issues in running an online platform and providing services free since the competitors are charging a customer for using their platform and services.