tell us what gym equipment you have available to you
i would think a 3 on 1 off split would be a decent routine for a young man
like you ..
this means you split your body parts up into 3 seperate workouts then take a day off
example and it can be broken up several ways
day 1 chest and shoulder excercise
2 back and bicep
3 legs
4 off day
repeat
throw in a couple days of cardio and ab training
your at a great age for transforming your body and i commend you
learn a little about nutrition ... increase your protien intake
this is just the tip of the iceberg .. we cant type everything there is a lot to learn
and there are a lot of different schools of thought on training i would recomend
you do some experimenting and trial and error .. dont believe everything you see and
hear at the gym .. good luck
while i dont agree with all the authors ideas i do think if you went to the library
and found a copy of "body for life" it is a good place to start
other books are probably as good hopefully others will chime in