Ha, I am by no means an expert...but will lend some advice based on my experiences with growing in Coco
I'd be interested in knowing what brand Coco you are using, and what nutrients as well...
And are you growing from seeds or clones?
--I find starting from seeds in Coco can sometimes be a challenge, and I prefer to start them in a bit of soil or in something like rockwool or rapid rooters
Feed every watering. But don't keep your Coco soaking wet. Let it dry up some before feeding again. Not bone dry though. Water slowly, especially if using fabric pots. Recommended to water more frequently with higher nutrient doses than flooding, but not a must. You can get away with just drenching them once a day (or as needed) until they dry up a bit.
PH in the hydro range. Testing run off is a different process. I don't bother with it but if you are interested you can find info on how that should be done online.
May need to supplement Cal/mag
Hope this helps. It took a couple runs of pure Coco to find a routine that worked for me. But once you get it dialed in, I think you'll find growing in Coco is pretty easy and forgiving. My best advice, even if you use a different brand of Coco, is to read up on the info papers and research by Canna. Best of luck grower