here is how I start in coco I feed every watering for the first week I use 1/4 strength nutes and full strength root enhancer (rhizotonic) I feed 500 ml between 2 plants (250 ml each) straight at the base of the plant (to get the roots to the bottom of your pot) not my method but
@Ronin to check when your plants need watering feel the weight before and after watering second week I up the dose to just under half strength (between a 1/4 and 1/2) and water 500 ml per plant but water in circles plant outwards spreading the roots(remember to feel the weight of your pots before and after) after that cant help you as I put the on a drip system