When to do first feeding?

It looks like you're asking about when to top dress after transplanting into a mix of Fox Farm Ocean Forest, perlite, and worm castings. Based on your soil mix, you’re probably good for a few more weeks before needing to add anything. Fox Farm Ocean Forest is pretty rich in nutrients, and worm castings provide some extra nutrition, so there’s usually no immediate rush. I’d say wait another 2–3 weeks before adding dry amendments. When you do, keep an eye on the plants to see if they show signs of needing extra nutrients. Make sure not to overdo it though—Ocean Forest can already run a bit hot, especially for younger plants.

Hello mate, its depend to on how long you want the vegatative phase to be. If you do more than 1 month i think you must will add dry amendements otherwise you could add the flowering amendaments at the beginnig of the flowering phase. Good luck and happy journey :)