Hi there.... i wanna know what is the right way to bodybuilding? am currently 18 years old and i am 50KG only... i wanna build just some muscle to make me look bigger in size...

What is the right way? I just bought a 3 Pound dumbbell... currently i feel like my left hand doesn't have much strength as my right, coz maybe i am right handed...

I want to know is, what is the appropriate way to build my body without hurting myself...