First Aid. Don’t forget to train it and have bandages at the ready. (Yes, even if you’re a healer. A well-timed bandage when you’re oom can be a literal life-saver.)
Group up for safety— The murlocs and kobolds will.
Autorun is not your friend. (See Kaivax’s rule for going AFK. Combined with autorun, it’s a recipe for sheer disaster.)
Fatigue kills. Don’t push your luck.
Some classes are slightly squishier at lower levels than others but get more powerful over time, so don’t overestimate their power at the start.
Elevators kill. Be patient and time your entry and exit appropriately. I’m looking at you Undercity elevators…