If it is in veg right now I would take a couple of clones of not the main stem but a couple of side branches. read morre bout how to clone on the faq I wouldnt take a cutting off a already flowering plant b/c the mother plants yeild will dramatically decrease. Once you have the clones in your medium i would check on their root every two to three days dont pull them out just move the medium away a little to see if roots are forming I would say once the roots are strong enough to support the plants growth without folier feeding (just to get started) wait two to three weeks in veg growth then you can put them under 12/12 good luck.