There's not really a way to correct this, hes a baby and he's exploring and figuring out what food is and isnt. If he's eating things he shouldnt be, like cardboard or paper towels, I would remove those from his reach. For the wood shavings, this is a normal reaction to it at first. He shouldnt actually eat much, rather just play with it in his mouth, but it may be worth proving a little bowl with some chick grit in incase he does eat some.
Does he have 24/7 access to food and water?
For his fear of hands occassionally, this is normal. Being prey animals, anything reaching over him could scare him. Just be slow. The way I picked my babies up as ducklings, while they were loose on the floor, was by cupping my hands slowly around them, and scooping them up. Always be gentle and calm. Avoid fast or sudden movements and he should be okay.