First time grower looking for advice about my lights and nutrient feeding

Hi I’m a first-time grower My lights are about 30 in from the top of the leaves My plants are two and a half weeks old it’s in happy frog pot and soil I have Fox farm fertilizer the three set I was wondering when and how much of what should I feed my plants and I have four lights two LEDs say they’re 300 w 1 LED says it’s 600 watt and I have a HLG 100 V2 4000K Horticulture Quantum Board LED Grow Light All advice will be greatly appreciated