Xeno's youtube guide is probably a good starting point. There's a 3.X series guide that I think still gets periodic updates. Layla Bell's twitch stream has a set of WAR openers at the bottom as well that might be useful, as is watching his stuff in general. I haven't seen anyone focus on teaching fight-specific WAR tips since Final Coil, but a lot of those same principles and tricks could be applied to later raids to maximise uptime.

There was also a Mogtalk tank video out there that I think ended up focusing a lot more on WAR than the other two tanks. I can't remember off-hand if they went into openers or rotations though.

On the whole, you'll have a significantly easier time finding good WAR resources than you will for the other two tanks, unfortunately.