i've been doing weights on and off for the past 6 years or so and i'm doing pretty well I think on the size of my arms, (maeve would be able to give an opinion other than mine), but mixed in with the weights I've also done a fair old amount of sport too, from swimming to rowing to various types of Kung Fu.
I mostly do bicep curls (only one I know the proper name for), I also bring my arms from my side to horizontal to my shoulders (holding arms straight out, ie like the rings in gym) and I also do punches holding the weights in each hand, 5kg in each hand and I aim for over 100 punches on each arm. The punches are pretty good for all parts of the arm I find, especially the forearm and shoulders. I also do some knife work but not everyone has access to those, but again that works the arms.
I would recommend having differing weights for the different exercises because certain muscles are always going to be stronger than others and I mostly go for reps over weight but thats a personal choice, I also do stints of heavy weights to build muscle mass every so often but mostly go for reps.
Reps wise you always want to be able I think to be able to do over 15 of anything you do, when I'm on the light weights, 7 1/2kg per arm I aim for 20-30 reps, when doing higher weights I bring that down to what ever I can push myself to over 15.
Mixed in with press-ups and sit-ups and the sport I do it keeps me in pretty good shape.
I'm only 5ft 9 and weight roughly 65kg, so i'm sure there are those of you out there who can do far more than I, at least I'd hope so.
------------------
I heard someone say once that the world is a fine place and that it was worth fighting for....I agree with the last part.
People of our generation should not be subjected to mornings.
Rbots website