Rob,

Off the top of my head...

Learn the jargon so you can talk the talk in an interview. Watch some videos on using software like Fusion 360 and pick up the processes involved in turning an idea into a real part even if you don't learn how to actually use the software for real. Watch some videos from Tormach and other professional machine manufacturers as well.

If you know someone already in your employers CNC dept find out what machines and software they use and study those. Don't get bogged down in the minutiae of an amateur desktop router using amateur software if that's not what you'll be expected to work with.

Kit