The first key to success is developing a routine. As a beginner, you want to start with the basics, which means incorporating body-weight exercises. I have put together explanations along with sample routines right here! Try them out.
For teenagers, the first few times at the gym is not the greatest experience. Little to no knowledge of how to train properly results in workouts in which nothing is accomplished.
You walk around, trying all the different machines. Probably using poor form trying to lift weight that is much too heavy. Try and mimic the more experienced bodybuilders, but to no avail.
Until you learn the ins and outs of proper training, you will make minimal progress towards accomplishing your goals. How long that will take depends on your willingness to learn, and deal with the fact that you are not going to transform into Ronnie Coleman overnight. Baby steps are the paths to success.
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