I'd grow one big plant, get the most practice out of the hand full of free seeds ya got....get like a 40w cfl in a cheap garage type reflector. use this to start the seedling off..
as it gets bigger add one of the leds, once it starts flowering add the second one....keep the CFL centered up and quasi the leds as top side lighting in the corners if you know what I mean...the side lighting effect greatly increases yeild.
going with one big bucket be it soil or soil less or DWC will act as a great buffer over smaller containers and volumes . personally I'd go "dirt" in about 20gallon. you'll only need to water once a week or so.
you'd be suprized to see how quickly a single plant can fill up a 4x4 givin enough leg room to fill its genetic potential
or id go with 4 plants in 5 gallon buckets, that work pretty good also.