First Outdoor Grow, NEED HELP!

My friend is about to dig a hole over his river bank. He plans to put 5 seeds in this hole. How deep/wide should the hole be, what soil should he use, (Fox Farms Oceanic Forest Soil?), what fertilizer should he use, (Fox Farms Big Bloom?), and what are some good pesticides for keeping bud worms away but not harming his plant in any shape or form? All help is greatly appreciated. THANKS

one hole per plant...
something like 2'x2'...
mix of ffof and coco peat also perlite wouldn't hurt..oh also earth worm costings are awesome!
fox farm nutes are expensive..check out jack's classic or maxsea...
people here use BT for bud worms...i don't have bud worms here so i have no knowledge about BT..
ALSO you have to hella trust your friend...imo it's best if no one knows....
good luck!