The number one thing a person needs to start freelancing is a customer/client (one with a retainer check is preferred). That's, for better or worse, Upwork and Fiverr for the fifteen minute web solution. It's the rollodex (o.k. contact list) for the traditional solution.

The reason people build websites as the first step to becoming a freelancer is because building a website is easier than finding potential clients/customers and closing deals. It feels like productive work and procrastinates against the unpleasant hard reality.

Getting a website in fifteen minutes does not provide sufficient procrastination and so it doesn't meet an important goal of a newbie freelancer's website.

Good luck.