You will need to develop a strategy to ensure that your name appears as a primary choice for the potential patients.
It may also extend to solicitors if you are planning to undertake Medico-Legal work.
An important route to your potential patients is through GPs. The hospital may help you organise GP talks and introductions. They may also organise evenings where patients can come and ask you questions about potential treatment.
You may wish to consider other innovative approaches.
There are a number of specialist Marketing Companies, but they vary enormously in the work that they do, so you would need to investigate them yourself.