There are plenty of HS second and third assistant jobs for young go-getters. Do what you feel called to do.
If you don't feel "ready" to teach high school for whatever reason, teaching beginners is very much a different animal. It's just as hard, but in much different ways. Don't start there because it's "easy" because it flat-out isn't. Go someplace you can be an assistant and learn on the job - that's how you get "ready" as a HS director. You don't have to run the show your first year teaching.