ur in luck. u've come to the right place. and, a little known secret ... it's easier for you to look great than some other ppl ... why? easy: ur young and male.
the first one is easy. you still have a youthful metabolism, so it doesn't take much to kick it into high gear.
why is being male and advantage. because we can do heavy weight training. you are n't concerned about having a skinny figure. doing weight 2-3 / week and decent cardio 2-3 / week will get you there faster. by building "big strong muscles", you increase your bodies ability to burn calories. however, you still need to do the cardio ... they won't do it all by themselves by just sitting there.