slimming arm workout for women??

Hey ladies!
I'm a dancer and I would really like to slim out my arms while keeping them nice and strong. What are your best moves? I workout at home (pilates, 30 Day Shred, dumbbells, bodyweight stuff) so any and all suggestions are welcome! Also, what weight should I be lifting? As heavy as I can stand? I have a gym membership so occasionally I go and use the machines, too:)
Thanks !!!