My advice would be not feeding them at all until flowering if you're using good soil. And by good soil I mean soil that has some compost, peat moss, perlite and you'll be good for at least the first 2-3 weeks.Yea I gave my autos one week of feeding I actually let it grow without feeding them in roots organic 707 in 3 gal and 2 gal the taller one is in a 2 gal and I regret it because the other one grows nice and stiff in the 3 gal and the next one to it she’s pretty healthy in the 3 gal I shouldn’t settle for less the leaves got burnt on the taller one because the buds were all over the place but thank you for your comment!
I would leave feeding the plants in the early stages to experienced growers as many new growers try to start feeding their plants as soon as possible and most of the time do more harm than good.
Oh and by the way I'm by no means experienced myself, I've just seen a lot of plants suffering from nutrients.
Good luck broski!