Completing a Phd dissertation is hard work. It requires that you become a true expert in a topic and spend a long time (usually more than a year -- preferably 2 or 3 years) focusing on it in depth. Have you really identified your strengths and interests within nursing well enough to make a committment to a research program in that topic at this point of your career? Are you sure you won't find a topic that suits you better?
If you have enough experience and self-knowledge to make that committment, then you are ready and should go for it. If you are still "searching for that special aspect of nursing," then I would recommend waiting a little while and practicing in an advanced role before taking the next step forward. For example, you could get a job at the Master's level and then begin to investigate schools
and go through the interview process, etc. By the time you have chosen a school, you will have more experience and be more prepared for the program.
Most of all, I think you are right. You will need to talk with the schools that interest you. If they frequently accept PhD students with minimal experience into their program, then their classes, resources, expectations, etc. will be in line with your needs. However, if accepting inexperienced students into their program is not common, then you need to be aware that you may struggle in the program as it is geared toward students with needs and abilities that are different from yours. That will make a big difference.