Ifit is a bigger than 5 man raid than it would be strat ds at level 54 (weird experience btw because i was such a low level i couldn't do any dmg at all it was either resist or miss all the way through the instance)^^
first regular raid 40 man would be MC.
Kara was my first raid. Wotlk had just come out. I was prolly level 72-73 in wotlk questing greens. We got to the last boss Prince Malchezaar. Let me remind you I had no idea what I was doing. I was a ret pally. If I remember correctly he does this thing and you cant get close to it??? Anyways we got him down to very little health and everybody died except me. I kept hitting him and healing myself til I finally killed him. Everybody in vent was yelling and I actually felt like a hero. I felt like I made a difference in the world. Nah I just took out the last boss in kara. No big deal now anybody can solo him pretty much lol. Good times tho. After kara was prolly 10-25 naxx.
I think it was Stratholme, but it also may have been LBRS. It's been a long time. I do remember an epic dropping from the first AoE pack in Stratholme. There was some discussion over who should get it and I think the person in charge ended up just taking it and leaving.