Should i start flowering!!!!! Advice greatly appreciated

PLEASE READ AND GIVE YOUR INPUT

well this is my frist grow ever so im pretty new to all of this. i topped my babies hopping they would get bushy and i thin its working just how i wanted it to. Most are starting to grow two stems from were i originaly cut it and more branches are starting to form on the older leaves closer to the bottom of the plant. I have some questions for the experts

I was told to top and put under my 250 HPS the day i topped them but i didnt( i felt they were too small), should i put them under it now?
When should i start to 12/12?

BTW the one in the bubble bucket is doing AMAZING!!! growing twice as fast as the rest and was the smallest 3 weeks ago. it still is small but it seems everything is growing bigger on it.

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