Is the school worth it?

I want to be a registered nurse for young children and teens, how many years of school is that? How much is a yearly pay? Wats the best school to go to (that's around Ohio)? My step mOm always tells me I'm not smart enough to b an RN but I think she only says that bcuz she doesn't want to have to helP pay for a reply expensive school... So is tht job/school/ school expenses worth it??