About starting a grow outside

Question from a fellow grower:

female plants grow outdoor for change sunlight to 12/12 and reach the flowering stage. What should I do?
do I need to greenhouse?
I live in temperate dry but weather in spring is an excellent.
I just do not know how the outdoor I can grow female seeds and I don’t know how change sunlight to 12/12 for begin the process of flowering.

I want grow thc bomb or atomic bomb.

When growing outside - no need to worry about light cycles - Mother Nature take’s care of that. Some folks grow marijuana from seed to harvest on a 12/12 cycle with good results