Starting Bubblegum Kush Grow

Hey guys, I had a buch of seeds from a bag of Bubblegum Kush and I decided to plant 12 ungerminated seeds in a Jiffy green house and now 5 days later I have 12 seedling that sprouted. I'm new to this growing thing so I'm wondering if you guys know anything about growing it. I have a T5 light, and it's a soil grow. I keep tabs on P.H., light, hours, watering, all that stuff, but I'm wondering how many weeks until I should switch the lights to 12/12? I have them on 18/6 right now. And does anyone know what Bubblegum Kush comes from, all I can find is info on Bubba Kush, and from what I read that's Bubblegum x Master Kush. If anyone else has any tips, or info feel free to let me know cause it would really help. Thanks guys, and happy growing.

how long u veg for depends on how much room u have to flower them in
a 1foot plant will get to nelly 2foot when u switch to 12/12
2foot to a 3foot plant
3foot to 4.5 foot and so on
the bigger the better is my thourghs, depends on how much of a hurry your in
small space 12 plants flower now

What's the soonest I could switch the lights, now? And if I did would that mean that I wouldn't be able to give it vegg nutes? I think I'll switch the lights when I get paid in a couple days, need to buy the good flower bulbs from the hydro shop. Do you think I could fit 12 plants under like a 2 x 3 foot space? I'm gonna use the 6 inch pots on these guys cause I have so many of them, I'd like to try SOG method, but I don't feel to confident on it just yet.