The thing about just planting a seed, is u really don't know if it'll grow till it pops up above ground. That's why I do the old paper towell method, but regardless, as long as u got a good bean in there, and u keep it moist, NOT WET, itshould come up. A foot tall sounds big to be transplanting, but taking into account that ur puttin it outside, a foot does sound good. At a foot tall, the plant should definately be strong enough to handle the shock of both the transplant, and the new found outdoor elements. Idk, if ur plannin on havin a fan on the seedling, but i would definately suggest it. A slight breeze on it will help stiffen up the stem which will also prepare it for the outdoor life as well. Good luck.