I think the most important thing a newbie
should know is how to use the bank, what good saving habits are.
Not many characters know how to use the bank right off the bat,
and end up carrying around all of their gold for the first week
or so. I know that was the case for me when I first started mudding.
I had over 150k in gold, before I realized there was a safe place
to keep it. I even lost about 50K due to thieving mobs that stole
the gold out of my pockets. I'd hate to see someone else go through
the same thing.
Saving (Save Game)
A player should also learn good saving habits.
I've gotten into the habit of saving after every mob I kill, or
if I'm on a killing spree, every 5 minutes or so. It's a royal pain
when the game crashes right in the middle of fighting a mob, and
you haven't saved in awhile. You log back in and some of your exp,
gold, and new-found eq is gone.