I just hit 68, which means I wasted 30 mins flying around in my new druid flight form. Fun, but not very productive.
It also means I'm close enough to 70 to start sniffing raiding. I bugged a guild recruiter at a raiding guild who said that in addition to mad skillz in my class, I needed to be tuned to Kara. Okay, I knew tuned was "attuned", but what's Kara?
Karazhan is a raid instance that requires a heck of a lot of work to enter. In this case, that work culminates in grabbing something called "The Master Key." Blizzard provides an interactive chart (Kara's in the middle of the "Raid 1" tier) to help you figure out where you need to go to get the key. I've looked; it's still overwhelming complicated. WowWiki tries to make things better, but you're still left with lots of links going all over. Whatever the heck ajs.com is has a Burning Crusade Progression Checklist. Still pretty danged daunting.
I'll start stepping through it all soon enough, and hopefully it'll make more sense.
Looks like we start here, in the old world beside Duskwood (Duskwood which was, I'd say, one of the more enjoyable zones in the old world).