A freelancing platform such as Upwork is an excellent option for people starting in self-employment.
Many of them require an application process before you can access your profile and get started. So it's a good idea to have a portfolio of work, resume, and biography or statement ready.
These platforms usually provide a client base and offer payment protection. That means you don't have to worry about looking for customers or collecting payments for your freelance work.
On the other hand, there are service fees, and not all platforms are the same. But today, there are endless options for finding freelance work.