I did 10 man scholo and strat way back when, also did 15 man UBRS. Several of those runs before I hit 60 (57-58 I think I started and used those runs to grind out most of the XP).
First real raid was joining a guild run when they downed Majordomo for the first time. I didn't know what the hell I was doing with my rogue. No poisons, no Slice and Dice and running around like a damn idiot.