Final answer:
The nurse's best initial action when preparing for a management position in a busy ambulatory clinic is to seek input from the staff on decision-making processes.
Step-by-step explanation:
The nurse's best initial action when preparing for this new management role in a busy ambulatory clinic is to seek input from the staff on decision-making processes. By involving the staff in decision-making, the nurse promotes teamwork, collaboration, and a sense of ownership among the staff members. This approach also helps to foster a supportive and inclusive work environment.