[cypher]

It really just sounds like exploring to me, the first thing they find when they approach your hand is fingers so it's natural for them to have a little nibble as they learn what's food & whats not!
I would just offer him a treat in your finger tips a few times to begin with then try putting it on your hand & if he goes for your fingers first just gently nudge the treat toward him & he should soon get the idea.
Take your time with holding him, try not to be nervous about nibbles as they do pick up on our stress or nervousness, to begin with just let him walk onto your hand, once he's confident with that try gently lifting your hand slightly or moving it, gently stroke his back & let him get used to all those stages before you try holding him.