I will not mention licenses and having a consultant with a license because, obviously, you’re aware of these things.
As for other things, firstly, you have to work in a clinic to learn how to manage it and follow up on insurance problems, appointments, management, etc.
Secondly, it depends on your specialty and the services you are allowed to provide. You should think about having partners to continue with the work even if you did not show up, plus how to guarantee their work, or you can get the help of someone when you’re out on vacation.
Other clinic problems abound, especially with clients.