forced flowering -greenhouse help?

New to growing- this will be my first 'try'.I'm growing in a greenhouse. My skunk#1 babies have started life in March,but I started putting black plastic bags over them for the last 10 days(? 4 more to go) to force flower them.
I read it should be 14 days of 12 hours darkness as I guess I planted too early in terms of the whole light /darkness thing for flowering.
Am I heading in the right direction???? Help I 'm desparate. Am using for pain purposes but love to smoke anyhow.Nothing hits the pain barrier like a good big fat joint.I could'nt tell you when I smoked last............SAD or what????
Thanks for reading

Yea sounds like your headed in the right direction... keep putting the bags on for 12 hours... not sure when you should stop that...

You will not be able to stop it until the sun is only up for twleve hours of light or when the plants have fully matured. Bags over the plants doesn't sound like a real good idea. Makes it hard to ventilate. VV

thats true... but tis outside... and people often do that... I am currently using a box over my plant.