new system, need help

hi every. i just got a new gt205 nft system to try my second grow with only to find out i cant use it from the start! well thats what it says. can someone please tell me if i can use it from the start anyway? i wanted a system that would take care of the watering for me so i dont mess up! ive seen many systems like this being used from the start on youtube so wondered if i can with this? i got some g13 northen light x skunk from attitude, 4" rockwool cubes with 1" starter cubes and flora micro, gro and bloom. the gt205 is a 20 ltr tank. so can i still use this from the start, and not to take the p*ss but can someone give me a little guied as to the nutes as i really dont wanna mess this up like my last soil grow. if i cant use this system from day 1, how should i go about looking after the rockwool cubes till they are ready for the tank? this is all new to me! thanks.

wow, most of the time i get an answer in 5 mins, guess everyones too high to reply! lol. anyway i think i got it sorted! im gonna put a bit of pipe on the pump going to a 3 way splitter and put 1 pipe to each of the plants, plug into a timer set for 30 mins 3 times a day and im done. nft to drip in 5 mins! sorted. thanks me!