help vegetative plant clone

hi i will turn my 60 day old sativa 5 foot tall plant in flowering today but i have only three plant cuz i was tinking they would be bigger but i have place for two more plant my question is can i take clone from it and put them to direct 12/12 in the same tent ....would i have bigger harvest like this or ???? can u help me please

I would root the cutting first under 18/6 or 20/4 lighting. The cutting will have no roots and will not flower if put directly into 12/12

OK then after how many week should turn it to 12/12 after having cut the clone