Super Excited Newbie Here

Okay, it’s a bit early for flowering, but I want to be ready. I have an amnesia haze auto. 1) Do autos go into flower by themselves when they are ready? 2) when they start flowering, do I need to reduce the Light hours and increase dark time? 3) what is the average age the AH auto starts flowering? 4) how will I know when it’s time? My plant is 35 days from seed. @Masshole, @AmnesiaHaze Thank you in advance.