did i miss anything i need for my set up?

im going 2marrow 2 a local grow shop and purchasing all i need in one stop

-was wondering if anyone could give me any advice or tips on anything i might of missed or should change...

-2 600w Hortilux - 600 Watt Super High Pressure Sodium Bulb (with ballis)

-2 XtraSun Parabolic Reflector

-huge assortment of 5gallon pots and different size rockwell cubes

-small floor fan

-roll of mylar

-timers,ph readers, temp and humid reader,

-few bags of Foxfarm Planting Mix

-foxfarm grow big and big bloom

-ph up&down

the one thing i cant figure out and really need help with and its kind of a 2 part question....

i dont know what size intake/outtake fan i need and how big of a carbon fliter....

thats the 1st problem and here inlies the second... i still havent decided the size of my room i want 2 use 2 grow...

i want 2 have atleast a 15-20 plant system

i want about 3-4p's every harvest(if it were a perfect world)

im pretty sure im going 2 divide my room in half for a veg room and a flowering room...(i just can decide how big 2 make the room so that my plants can grow 2 a pretty good size without taking up 2 much room but at the same time having enough room for all the air 2 circulate and heat 2 disperse

sorry 2 keep this going but :rasta: and i really want 2 get this right it if my 1st time and i know i have alot of trial and error 2 go threw but i plan on having a green thumb for a verry long time....

just a few last things i wanted 2 say b4 i go.... I WILL POS PICS once i have it all set up for you can see what u helped me create and not just a waste of yr time...a