Mega-Newbie here

so, my friends and i just bought a 4' "hydro harvest", and ordered 20 blueberry seeds. we're gonna be getting a 400w MH/HPS lighting system soon, and eventually another 4 foot garden

i'm looking for some real basics here, the garden came with a nutrient solution, and im not sure if i should add supplements, or other fertilzers or what to it...

my friend bought a 20-20-20 fertilzer and also a 15-30-15 one from when he was gonna try growing in soil - i dunno if we should use those?

as far as supplements, theres been a few ive seen available (i live near kitchener ontario, and have checked out the breslau store, they have tonnes there that seem to be just for ganja)

#1 - any recomendations as to what supplements to buy, if any?
#2 - how much of the nutrient to i add? i cannot see any measurement in the instructions we got with the garden
#3 - we're growing in a storage room in this guy's apartment, what kind of air ciculation can/should we do? will just an ordinary fan blowing over the plants with the door open work?
#4 - how far above the plants should a 400w lamp be?
#5 - do we need an air purifier for just these 8 plants, or even the 16 we'll have growing later on?

sorry to be such a newb, but i wanna get some really top notch pot growing and into society

#1 the nutrient solution is fine for now (with stuff dat camewith garden) shud b fine as they usually supply u with a veggie and bloom so if they gave u that then u shud b more than ok!
not a lot jst mix like indicated on bottle and then jst water every 1-2 weeksuntil it gets bigger then more often, trust me u'll no wen it needs watering(check soil with fingers wen looks a little bit dry then add a bit.
#3not a lot if u get four desk fans on each corner surrounding the plants then that shud do for now unless u get about 20 plants then u might need an extractor unit.
4#hang the 400w about 10-14 inches above ur plants (depends on the temp if u have a air cooled hood then about 12 inches)
#5 simply no!
6# good luk