well best not to feed until week 3 sometime if you have good soil. Then you want to do is look on the back of a pack and find these letter N-P-K. For veg you want high in N and low in P-K example (N-P-K 10-1-1) or get some organic fertilizer called bat guano (bat shit) and that should do. remember this is all in vegitative (18/6 light schedule) and you only give 1/4 or 1/2 what is recommended. Then comes Flowering and you can give it what ever the fuck you want. Even cat shit lol no I don't know what to do in flowering actually you will have to wait for someone elses opinion.