1 plant? And what will you do when that one plant is a male or "fails to thrive"? It happens often enough that it needs to be planned into the grow so I always suggest planting at least twice as many as what you seek, IOW, plant at least 2 but to be safe I'd plant 5 and still be hoping & praying for one nice healthy female! But if you're looking to keep this hidden from mom or roomies, forget it. You can't hide a grow from mom...and room mates will know as soon as the hum of the lights come on...then there's the smell. But if you have all of that covered it'd be best to start with a light then build your grow around it. A 250W would be ideal for your purposes and will grow 4 plants in a two month veg, 2 month flower or 4 months total. One plant grown within that time-frame usually produces around 1oz +/- of dry, well manicured bud.