I'm not a top mage, but watching every 2.2k+ rated mage/rogue video that's come out in the past 2 years or so has really helped my game. I learn most of my tricks from watching videos. Try to download instead of streaming whenever possible, you want to watch in the best quality you can get.
I'd also recommend you both get engineering for rocket boots. It's expensive to level, but I'm pretty confident it will always be a strong PVP profession. So it should be a 1 time thing to level, I can't see a need to ever drop it in the future. Theres a few other toys that are more BG oriented, like the 16sp + parachute to cloak enchant. But double rocket boots on rogue/mage can really help with resetting fights and making clean escapes (or occasionally chases for a kill).
Arenajunkies is OK, but theres so much trash on there. I really wouldn't compare it to EJ myself.