Hi Everyone. My name is John, and I have just started looking into doing some weights after being introduced by a few... bigger friends :). I am 15 years old, and have already started doing a few exercises here and there for around 2 months now. I currently own one 25lbs dumbell at home.
First, let me tell you what I am trying to achieve. I am trying to build good strong shoulder and arm muscles where I can clearly see them without flexing. I am looking to find a quick way to get to this stage. I AM willing to work towards this goal

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Now let me tell you where I am right now. My right arm, I can do 15 arm curls at once, or 3 sets of 6. Now my left arm is a bit weaker. I am only able to do 12 arm curls, and 3 sets of 5. Now this is with my 25lbs dumbell. I am NOT doing this every day. Maybe once or twice a week if I remember. Like I said, it really varies (I know this is bad).
Does anyone have any suggestions as to what I should do? Any advice at all. A friend of mine has a bowflex machine, and I can have access to a whole set of dumbells, including some standard weight room equipment at another friend's complex 'club house'.
Thank you very much for reading, and hopefully, I can glean a few things from the pros at DiscussBodyBuilding :).
Thank you,
John