if your soil has decent ammount of nutrients in it then you wont need to use the carbo for about 4 weeks...then use till u flower!!
big bud is to be used from week 2 through 4 of the flowering period....but i suggest using it until end of week 5! then plain water for weeks 6-8/9 !!
use it every time u water (best to water every 2 days!)...make sure measurements are right