You should leave the snake alone for the week, do not handle or try to feed. The snake will be fine with out food for one week. For the first two or three times you feed you should give it live if that is what it is used to. The only way the rat/mouse is going to injure the snake is if you leave them unattended. After you have established that the snake will eat for you, then you can switch to frozen/thawed if you would like. The only reason you should wait to switch is that if you do so now, being in a new environment, with new/different food, it could cause the snake to refuse food, or even become stressed enough to fast for a few months, which is not what you would want.

When and if you do switch to frozen/thawed, after soaking in warm water to thaw, you should blow dry them dry, really concentrating on the face to make it the warmest place on the body, so the snake will most likely strike the head. I say this because most of the ball pythons I've had that were switched from live, would not eat them wet, or even towel dried for that fact. Some of them I even had to scent with used mouse/rat bedding to get them to eat it.

No matter what way you want to feed, it will still be okay, but if you stick with live, just never leave them unattended. Good luck to you!