Let's see...:
1.) i have no answer to this question...i think max. 1-1,5 oz..

2.)i think you could put it strait in 12/12...but then you can't get the max yield out of the plants in a box this size....it would be better to veg. it for a couple of weeks in 18/6...and you could LST the plants

3.)Sog means See Of Green i think...it's like you don't have a few bigger plants but many smaller plants close to each other....
but i'm not sure...
Scrog.: if you visit this log you will see what it is...the buds grow through a screen...
http://boards.cannabis.com/grow-log/...obviously.html