Arm workouts: Building strength and definition with dumbbells :)

So here’s the deal... I’m 15 and a half years old—standing about 6 feet tall and weighing around 145 lbs...
haha, basically... can anyone out there suggest some exercises using 10-pound dumbbells (yeah, just little hand weights...) to help me get stronger and tone up my arms?
If you could find a video or maybe even just a quick sketch explaining how to do them with the right form... or even a full workout routine... that would be awesome... 🙂
Thanks so much in advance! 😛

Locked.

Take a look at the current threads in the sub-forum index—specifically the ones covering workout routines and advice on how to pack on some muscle mass.