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I'm not an expert grower, but I'll try to help.
Re: White Paint. I'm not sure if it matters much what kind of paint (glossy, flat, etc), as long as it's as white as possible (I've found a color called "Super White" that works well), because white paint works well due to it reflecting all the color spectrum, whereas other colors absorb some light and reflect some; white reflects almost all the light.
You *can* use 2 plants in a 5 gallon bucket, but i don't recommend it. Your plants won't appreciate it much either and it will probably become more of a pain in the ass for you.
As far as the smell and stuff goes, I grow in a closet in my apartment and I just have one of those charcol/ionizer air fliters going in my room for my "allergies", although in reality it's filtering the smell. But the smell isn't that strong and over the summer I found some weed plants growing outside my window anyway from someone else, so I don't think you have to worry about the smell for your apartment building. Probably.
For the soil, there's a lot of "schools of thought" but generally you want it inert as possible (no ferts) and you want to mix your own fertilizer instead of using ones that are in the soil. The reason is that if you use soil that comes with it's own ferts sometimes you get "fertilizer burn" which is when your plant has too many nutrients for it to use and it starts to choke and die. Also with soil that has ferts, it can become hard to tell how much fert is still in the soil.
*they* say you should have about 100 watts per plant, but I've grown with less. Since I'm sure all 10 of your seeds won't be female, 600 watts should be fine. Just make sure it's the right kind of light, do a search for "marijuana lighting" or something like that.
HTH. Good luck.
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