For a first time grower, your biggest risks are over-watering, over-feeding, and over-lighting.
Ocean Forest is a "hot" soil, meaning it carries a substantial nutrient charge out of the bag. Your plants are small relative to the size of the pots they're in, so there's already a ton of nutrients available for them. If I were you, I wouldn't be feeding for at least a month, maybe more. If the lowers start to yellow, feed. (You can gauge soil nutrient content with a ppm/EC reading of your runoff water, but that's a little more advanced.) In terms of watering, when I run Ocean Forest or
Happy Frog, I water to 10% runoff when the pots are light. Again, with small plants in big pots, the risk of over-watering is high. (Over-watering is watering too often.) With lights, you want your leaves to be flat and level. If they're curling, twisting, taco-ing, canoe-ing, or if you see a lot of yellow between the veins, you're probably over-lit. If the plants are praying an hour before lights-out, they're ready for more light.
Just one guy's take. Hope that helps.