First ever grow

Hello my friend, because you use coco coir you always need to feed because this medium does not contain any nutrients from itself. You can use a light nutrient solution with EC 1.0 and ofcourse pH 5.8

So you're using Coco as a growing medium and that's a little tricky for first time growers because you have to pH it properly and pre load it with nutrients before hand. I recommend starting with something easier like promix HP or Coast of Maine. A more well balanced soil that you don't have to add everything to. That being said if you're going with the Coco, you're going to have to properly pH your medium with loaded nutrients for early vegetation. A ppm of around 200 and a pH of 6 is what your Coco should be at before you transplant into it. Good luck brother.

If transplanting into fresh, quality soil. fertilizers may not be needed for the first 3 weeks or so. Transplantng and feeding immediately is a no-no...........wait at least 5 days for the plant to settle and recover from the transplant shock if using anything other than good quality soil. Soaking with seaweed (kelp) extract before transplanting, then watering the fresh transplant with seaweed extract afterwards can help minimize any transplant shock.