I know you only got him yesterday, so give him a week or two to settle in before you try getting your hand near him. It takes them a while to get used to a new house, new people, routines and vibrations. Just do the essential feeding and misting for now before getting a hand too close. Remember to move slowly too, any sudden movements can scare them. When Amy was small I offered her a Morio (super) worm for the first time and moved my thumb quick to stop it falling off my hand and she totally freaked out! She had her chin out, arm up karate style and was rocking too, bless her!