Buy Botanicare products: Pure Blend Pro Grow+Bloom, Cal Mag Plus, Silica. You also need a ph meter I recommend Oakton pH2. You need pH up and down. For the first 3 weeks don't feed your plants at all only water them with pH 6.0 - 7.0 water. After 3 weeks you follow their feed schedule mixing the Silica in first then the Cal Mag Plus then either Pure Blend Pro Grow or Bloom depending which cycle you are on. Make sure to always set your pH of your nutrient water the same as it was when it was just water, always. Use 1/2 the recommended dosage until you learn the strain but follow this feed schedule
After 3 weeks you could change the light schedule to 12 hours lights on and 12 hours total darkness. But you will probably still need some veg nutrients for the first 3 weeks of flower anyway. So you do need both grow and bloom nutrients.
Here's the feed schedule, work got busy.. Hit me with any questions you might have. This is mixed into a gallon of water Silica first, Cal Mag Plus next because of the micros, then whatever else.
http://www.botanicare.com/Assets/PDFs/Botanicare_FeedSheet.pdf