First time grow, Most likely going to need some help.

[pushit]

OK so just a little update, all 8 of my seedlings have come through the soil, still 3 trying to germinate. I know its too early to be thinking about but, my grow room is only 3ft tall floor to ceiling. I need to keep these plants short and so my questions are A) how long do you suggest me veging? B) should I top them at the appropriate time to make my yields as high as possible?

Have you done any reading on scrog or lst? With limited height you might be better off doing either of these IMO. Just a suggestion.