Hi nurseboy,
I'm not in your field but I think that it might be a good idea to develop some initial questions and carry out a pilot study. You could do a few in-depth interviews with nurses just to see if you are down the right path. A pilot study will not only help you refine your research questions but will elicit some new issues you haven't even considered.I have done a pilot study for my research and found it to be very useful.
Hope this helps