The only thing he would need to buy would be the perlite and maybe the potting soil, but I don't even use that all that often. Recycle and reuse
. Coco if improperly used can lead to gnats or aphids when mixed with some real organic additives. Either mix it all separately or go with a bag formula if considering the coco
KC 
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where u from? please bro im from a place where bud is hella potent and i got a few boys that work at cannibas clubs and they use what i use but anyways...i got foxfarms with coco and i use bud blood 3 days b4 flowering and up to a week after to and start using big bud 25 days into flowering... u should try it