peanut, sure here it goes, Its late so ill do my best since im tired...
First, if possible find someone with bigger and more defined arms than you and setup a schedule to workout arms with them EVERY arm workout.. I have done this recently and it motivates the hell outta me, In about a month or two I might have to find someone to replace him
Here is an example of what vander suggested, I'm sure he might have something to add considering his arms are inches bigger than mine.
Set 1 Bi's: Standing barbell curls, 4 sets one warmup, 3 heavy but perfect form 6-10 reps with spot. Good squeeze and slow negative on everyset
Jump to Tri's Set 1: Skull Crushers, 4 sets Same thing as Bi's heavy but good form on Every rep, if you don't need a spot by number 10 then you are not lifting enough, thats why he is there remember.
Set 2 Bi's: Dumbell Curls, seated or standing, 4 sets, same thing, have to have spot on these to get full effect.
Set 2 Tri's: Seated over the head presses ? Not sure of name but Sit with arms straight up with dumbell over head and keep elbows parrellel. anyway 4 Sets, same thing
3 Bis: Preacher Curls Barbell, 3 Sets
3 Tri's: Cable push downs 3 Sets
4 Bis: either hammer curls standing 3 sets or reverse curls, or incline bench curls. something that will isolate whatever part of your arm you think is lacking
4 Tris: Kickbacks 3 sets or something isolating tri.
anyway you get the idea, if your not sore after something like this then I dont know what to say, maybe your not getting the same intensity out of your workout than i am.. but try this and grow
I would suggest 4 - 6 weeks minimum, I'm doing this twice a week right now for my second week, fun stuff
Anyone feel free to critique this workout, or offer other suggestions