If you live in the US, I would order some fox farm ocean forest and some fox farm light warrior soil (I would create a mix of the two, as light warrior is better for seedlings (as it won't burn the seedlings with too much nutrients), whereas ocean forest should supply some (probably not an adequate total amount though) nutrients to the plant throughout the vegetative and flowering stages of growth.
The two should provide an adequate npk balance if you mix your soil just right (maybe with some extra guano or coco coir, etc).