the #1 exercise for building big biceps is weighted pullups. #2 is rows
the biggest mistake i see skinny newbs doing are spending half their workouts in front of the mirror curling and jacking off to themselves with their 11" arms.
you shouldn't even be curling if you got skinny arms. stick to compound lifts for a year or two minimum, then you can do the curling. i get so sick of the groups of skinny guys who hog up space in the free weight section doing their 20 pound dumbbell curls and their arms stay small. and they use straps and gloves along with it too