How and what gym moves to do to improve my upper arms? From the shoulder to elbow?

I work out for 4 weeks on and 2 weeks off.

Best 2 workouts you know that directly work this spot.

Weights I can use in lbs please and do I use arm bands?

Would a slam ball work too? I don't want to buy if it won't target that area.

How and what gym moves to do to improve my upper arms? From the shoulder to elbow?
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