How early you put them into flower depends on how big your space allows you to grow untill harvest. A lot of factors determine how long they flower/ ripen. Mostly genetics, but also nutes & lighting. The more you grow, the more you'll know, so learn as you go! Haha! Eat your heart out Shakespeare!
--- Skim over the threads, read the post that apply to you, & when you have questions, just ask. Most of all, don't panic if something seems to be going wrong, just apply the first sentence of this paragraph. It's not as hard as it seems at first. Just remember it's a plant, a weed actually, & you've come to the right place for enlightenment! ~~~ PEACE! ~~~

P.S. Re-read Wheezys post to you. That's the best most condensed info you'll find for now & if you have more questions on the subject when you get to the flowering part of your grow, remember the first sentence of the above paragraph.