The best way to get strong actually is to get fat by eating a lot of meat, greens, and carbo due to increasing your own needs.
That's why at first you can lift weighs to tone the muscle, but if you want a big body you will have to keep up for a while and then push yourself to the limit.
After exploding a few veins, your muscle will increase. After that, you only need to keep up so the day you are old, your skin won't turn into a skin matress.
And don't forget your legs. You need good cardio to keep good strenght