Rodney is right. Take it slow, you want to do enough weight so that by the end of the third set your arms are tired. If they hurt you're doing too much, slow down on it.
If you want to get stronger I suggest doing reps of 5-10 (less mean bigger bulk, more mean more of a cut to the muscle), and sets of 3. Increase your weight by 10% each set, it will get your mucles used to expecting more and more weight, and this has been proven to cause the best muscle growth. But, I cant emphisize this enough, only do enough weight so that your arms are tired, not in pain. If you are having trouble on the first or second set you're doing too much and need to ease off.
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