nice number of plants , put the timer to be 12/12 which means its comes on at 6am and goes off at pm..make sure they have COMPLETE, I MEAN DARKNESS or they will not be good... good luck
nah actually people use the 24/0 for veg all the time its your preference, but in flowering stage it is crucial to have a 12/12 and I would buy another timer to make sure that one wont fuck up again, you dont want man plants or hermies..