How many dumbbell exercises should I do in one workout session?

I am 17, Male, about 5'11 and 166Lbs - I want to build up my arm muscle I currently have two 15 pound dumbbells, but I want to get some 25 and 35 pounders. Aside from doing pushups and chinups, how many different dumbbell exercises should I do in each workout session? Are there any certain ones that are good for gaining results?





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