well it depends on how much work/money/time u want to put into this.
but heres my ideas on what u gave
its 12 ft long so the space really isnt your problem, but i doubt your light is 12ft long so if its centered and high enough you can probably fit about 8 ideally and max amount of smaller plants.
or less bigger ones. but a 600w light depending on what kind is going to get HOT!
ventilation would be MY first concern.
anyways keep us posted bro

what kind of light do you have?