Being a nurse manager requires patience. A general knowledge of the area you supervise. Fairness and firmness are essential. I suggest strong leadership skills and be able to do what you expect others to do.
This is not a job for the faint of heart. Take the advice from the other comments plus learn business management. You’ll need to understand how to staff your floor, budgets, resource allocations and quality improvement for patient experience. I would also spend time with nurse managers to get their perspective about their job and the path they took to become a manager. It was hard for me, very rewarding but also very difficult.
Anyone with BSN can be one, but very fee want it. For once you will be dealing with patient/visitor complaints and you will be on salary therefore typically making less than floor nurse ( no shift diff. no OT)
Anyone can be nurse manager but very few want this job because it is salary withsut differentials and OT. If you are BSN you can easily get this job, but don’t be surprised if you end up having smaller check than floor nurse. Another thing is, you will be dealing with family/patient complains.