Advice needed for first timer

hi all looking for any advice on this project of mine i am growing BFG Big Freindly Giant in a 48 pot iws system i am starting from seed. I am picking up seeds fri . i have the temp of 27degress so temp is gud what shud be me ph level ? i am using canna a and b with pk is there any other nutriants i shud b using ? i can get pics of set up if needed . Do i feed plants when light on or off ? how many times should i feed them ?​