When I was learning Flux I thought this video series[1] was really helpful. That being said, I've switched to Redux now and am much happier for it. If you're into videos I highly recommend Dan's (creator of Redux and on React core team) Egghead series[2].
I second that. Anything by Dan Abramov is worth your time. In addition to being a brilliant dev he's an excellent teacher. The egghead series is fantastic.