I do two circuits of them for each singular arm exercise at 10 reps, so 2x10 per exercise. Push-ups and other related activities to taste.
There's a few other exercises I do in place of or in addition to these. They are:
Empty the Can
-Front raises with supinated and pronated grips
-Wrist raises with supinated and pronated grips
-Arm circles with wrist weights
I would recommend 5 lb. weights - that's what I most commonly use. Sometimes I under and overload to mix it up with 3 pound, 8 pound, and 10 pound weights too.
EDIT: Also, doing this is probably good for your arms:
