will 250 w do?????

im thinking of planting with 250w iread were ineed mh to veg and hps to flower well my q is how long on veg cycle and how long on flower clcle and i think veggie is 18/6?? and flower is 12/12 but not sure but for just playing around with is 250w system worth buying or do i need to go 4 400w but for the space i have just need small grow thanks for any help oh and if useing 250w do i need to worry about fans blowing heat out and fresh in??

You dont "need" MH to veg, you can choose to have it for vegging and yes 250 is enough, for vegging and seedlings even 80 watts is enough.

ALL MY SEEDS, CLONES AND VEG IS DONE UNDER CFL'S. MH NOT NEEDED.

GOOD LUCK