Any management job is difficult with very little satisfaction. Hard work and many hours complicate the many requirements made. It helps if you have a assistant to buffer the many needs of heading a unit. If you are talking of shift supervisor,thats much easer. The shifts are long and demanding,but when you go home ,that is it,you are done. I am not trying to discourage you at all,just being realistic. One has to really want to progress up the ladder to assume this role on a unit. Many times once you start,you can make it your own and establish protocols that will assist not only your employees,but you in management. Be kind,open minded,see the Grey areas,not just black and white. Remember everyone is different and their nursing style is their own,as long as safety is met,kindness is a priority and patience come first,it should not matter. Not everyone has to go A-Z the same way.
I hope that you have a great boss yourself to guide you and mentor you in the transition. Good Luck!