Well, normally when you get a new reptile, you should leave 'em alone totally for a good 2 or 3 days - usually I go about 4 or 5 days depending on when they've last eaten.
Also, once they have eaten, don't handle your corn for a couple of days. This is not a 100% strict rule, some corns are fine being handled after eating, but a lot will regurgitate the meal - ESPECIALLY when they're already stressed by new surroundings.
I'd just leave him alone for the next 2 or 3 days. Keep an eye out though to make sure he doesn't regurgitate the food. If he does, take it out, and take out the substrate surrounding it so you don't get a rotten mouse smell in the tank. If he doesn't, watch out for poop. Again, clear that out, an the surrounding substrate and replace it.
But make sure you leave him alone to settle in for 2 or 3 days. Like I said, I usually like to go about 4 or 5 days if possible. Just give him time to settle in and you may find he won't strike at all.
Right now he's a lil stressed out and doesn't know who you are. The fact that the pet store actually warned you about "if he bites you" leads me to believe he's been handled very little in the past and the pet store knows he's a biter.
If this is the case, then the only thing you can really do is handle him to calm him down. If he bites, don't put him down straight away. Otherwise, he'll learn that when he bites, you'll let him go and that's what he wants. He knows that if he bites you, he'll get his way, and thus keeps biting you.
If he bites you and you keep holding him, sooner or later he'll give in biting because he learns that it won't get him what he wants
But, give him a few days to settle in first. Nice low-traffic area of the house. But, keep an eye on him and check for poops or regurgitated mouse. If he regurgitates, try feeding again in 3 or 4 days.
I've got a psycho here at the moment with a terrible attitude. Snaps all the time and has drawn blood several times. But, I've just gotta stick with it and make him realise I'm not going to hurt him, and that him biting me isn't going to make him get his way
Best of luck!
