Back to School?

I'm thinking of starting to look for a real career but I'm not sure exactly in what yet. I can't really see myself doing one thing for the rest of my life and I've really liked the versatility it's given me being in different areas. I was looking through job listings to get an idea of what's in demand right now and it seems like health care might be the way to go for me. There were quite a few healthcare listings for things I might be interested in doing so it's a good possibility. There are so man different types of positions within the industry that I didn't even realize were there so it's not like I have to go through a whole ton of schooling again. I could do anything from billing to a nursing assistant and be fine. It's something to think about since working for myself doesn't help with insurance and retirement.