I think that pretty much sums up Necro raiding (or at least 90+%), plus you'll also do some corpse summoning from time to time in zones like Plane of Sky. It may not sound glamorous, but when you save the entire raid with FD and a soul stone that is pretty cool.
Hyjal organizes sporadic raids (I've seen ones for Kael, ToV, and Plane of Growth), but otherwise there's not a whole lot of communal raiding going on. The vast majority of raiding is done by guilds.
Get the Discord app, listen carefully to what your raid leaders tell you to do (you don't have to talk), and follow their directions. That sounds obvious, and yet many people have difficulty with it. Other than that, twitch a lot, and when the raid leaders yell something to the effect of "oh crap, camp a cleric" hit feign death (and be sure to have some soul stones on you).
Also I'd be remiss not to mention that
Anonymous is recruiting. We welcome new raiders and happily teach people how to raid. We have two regular raid nights (8pm EST/5pm PST: Wed = Plane of Sky, which you need for your epic, and Fri = HoT, a chance to get a suit of
Dragon Armor), plus we raid other targets on other nights. All in all we're fairly relaxed/casual and have no raiding requirements to stay in the guild.
But if Anonymous doesn't suit you, for whatever reason, check out
the guilds page in the wiki to find a guild that fits you better.