Royal Dwarf cheap micro grow

--CHEAP GROW-- This is my first grow so i've decided to buy an easy to grow strain : Royal Dwarf from Royal Queen Seeds -- Germination -- Due to a lack of experience i've killed 4/5 seeds during the germination process. 2 of them didn't sprout, 1 of them sprouted but didn't go far and the last one smelled really bad. I've used the paper towel method for those one. For the 5th the one who did it i've soaked the seed in water for 12 hours then planted them direct into the soil. -- Soil -- I know that it's mostly recommanded to use ligth soil but had in my garden a long during organic indoor soil (NPK 14-7-9 // pH : 5.2-6.8) There are also clay pebbles on the base layer and the top.. why? The properties of clay pebbles mean they are often used by soil and coco growers as a base layer when potting (to increase drainage) and as a top layer (to reduce the evaporation from the top) -- Feedings -- I've bought a Green House Seeds booster (0-30-27) and will use it during flowering stage but 1/3 of recommanded dosage because i also water the plant with a compost tea -- Growing space -- I've made my box from an Ikea furniture. - fan - Mylar paper - 27w Growing LED (120 leds) (with the hope it's enough) - small carbon filter -pH meter - scissors - Hygrometer ans thermometer