How to tame a baby corn snake?

Alright, so I got my corn snake Wednesday. (he was shipped from CO) The guy told me not to mess with him for about a week, so i took the cup he was in and laid it in the cage and as soon as he was out and saw me taking his box out, he bit me! (it didn't hurt just surprised me) And then he disappeared under his bedding. Another thing is he's wayy smaller than I expected.. he's a baby; not even a year but from his picture he looked bigger. How can I tame him without hurting him? I'm afraid I'll hurt him cuz he's so tiny.. and he bites me every time i try to pick him up. And he runs away every time i try to pick him up.