Daughter wants to join the airforce to do logistics - good path to start on before she joins?

If she wanted to go down this route, what should she work towards to be able to do this? She's a Jr. in high school, and is 16. We're religious, and she plans on serving a mission when she's 19. she would have a year to take classes after high school, but before that mission, would like her to be prepared as much as possible before she joins, if she does (that's a few years down the road of course.).

as far as picking jobs, I know you have to get scores on your asvab, but how does that work? I assume different jobs require a minimum of a score on a test, is that listed anywhere?