Need some help in my set up

AS soil goes and taking care of the beauties im +/- good already did some out doors and it grow to what i would call a little tree.

But im trying to get a closed set for growing the space i have its a 3 feet square and 3.5 feet tall. i have a 400wts hps lamp.

Its the 400wts lamp enough for the space?

How many plants should i put in that space?

Sorry for the newbie questions.

thats perfect size and it depends do you want to grow sog or bigger plants because if you want bigger plants you need acouple gallon pots so you can probably get 4 bigger ones but if you go sog its as many as you can get in there probably 9-12

Mr Luso, I think that you may run into a few problems. You don't talk about venting but, it's going to get hot in there. The other is space, at 3 1/2 feet tall, figure 6 1/2" for one gallon pot, about 1 foot for the lamp itself and the system to hang it, about one foot between the lamp and the top of the plants. That's only going to leave you about 1 foot for the plants, is that what you are looking for?

So maybe ill trow the roof down and build it a bit bigger. the vent i have one pulling air in and one out then depending on the eat ill think off something to cool it down. Tks all since this is my first try in a inside grow im a bit lost. Tank you all as soon as i have my seeds and everything build ill post some pictures.
By the way how much time does it take to for them to get ready to farm in a green house?

will im upgrading my setup i thought i give it a try with some seeds i have arround fi just want to grow 1 small plant just to make experiments in a indoor situation the grow bow is 2ft*2ft*3ft tall im going to put just cfl bulbs how many do i need?
remember is just one plant