are u in soil or hydro? big dif.. if soil go few but large in hydro u can go either but if ur new, id just throw plants 4 per square foot sog style on a flood n drain table or dwc 3 gal buckets. just pack the buckets together as many as u can fit, no lst for sog..if u want to veg them for a few weeks then you will need to do some topping and training, to many people think a taller plant will yield more, on the contrary shorter plants will yield more given the amount of tops in the space, any more than 3-3and1/2 foot plants and the light cant penetrate to lower branches.if u go tall ull need to clip lower branches unless u like little buds and lots of trimming..my opinion only, lots to think about for u