Start them in a soil mix of something like 1/3 coco coir or peat, 1/3 perlite, and 1/3 or less wormcastings. The wormcastings should provide nutrients until they are two or three weeks old, then add some fertilizer, I'd say something like fish emulsion to start, maybe 1/2 strength initially, then your can start adding stronger fertilizers like bat and seabird guano. During veg use high nitrogen fertilizers, then for flowering use high phosphorus low nitrogen fertilizers. But be very careful not to overfertilize, high nitrogen organic ferts can hurt your plant. Kelp or seaweed extract may be good to use, especially early on.