Using rockwool
Before using rockwool soak overnight in water at pH 5.5 and allow to drain. This reduces the alkalinity of the rockwool.
Plant the seed in the rockwool cube. Gently bury and cover over the seed using a blunt instrument and allow to germinate.
When the seedling develops its first green leaf, begin to water sparingly with half strength complete hydroponic nutrient. If necessary adjust pH in the watering can.
When the seedling has developed white roots to the outside of the rockwool it can be transplanted to a larger rockwool block which has been soaked and allowed to drain as before.
Keep seedlings watered with half strength hydroponic nutrient. Your plants are ready to be transplanted to your NFT system when you have lots of white roots on the outside of the large block.