newb with white widow questions

so cannabisseeds.com is in its last day of a mega sale and i just had to buy 12 white widow seeds (feminized) for $29.

i couldn't pass it up despite the fact that i am a novice grower.

here is my setup:
250-watt MH. 4x4 growing area. i am maximizing the light with emergency blankets, good reflector, and my walls are already white.

i really don't wanna mess this up cuz I've never smoked anything like white widow.

Anyway, a couple questions:

1.) with a 250-watt MH, how many plants should i try to grow? (i might add another 250-watt HPS) if its growing real well

2.) how long should i wait to put the sprouts under the MH (i was told to wait a week or so)

3.) is there anything strange and unconventional about white widow that i should know before i start? I know they are slow to harvest. or any other rookie mistakes you can forsee?

sorry for the long post. thank you in advance for any replies. very friendly ppl on this site

there is no sale, cannabisseeds.com is a scam and all strains are the same shitty gentenics sad to say.

ouch. so did u ever get your seeds man

guess he didnt get them.... =-/ taht sucks.. if it sounds to good to be true... it probably is.. got to Nirvana... or Attitude.. just google it and you'll find them.. ive placed orders there.. and they are good.. sorry u prolly didnt get them man.. good luck if you try ordering from anotha site.. just take it as a loss and hey.... at least they only got you for $29.. and it wasnt $290.. or somethin like that.