Its that simple, leave the light on all the time ( They will go for years) and put your plant under it, when it has gotten big enough to flower then you just leave the light off for 12 hours /on for 12 hours each day. in a couple months you will have some bud to smoke. Learn as you grow.
Want really good bud? That is a completely different thing, lots of knowledge is needed to grow good bud. You will also need to spend some money on the right things needed.