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...the lights open and the batry died?

 
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Call or go to you local dealer and will give you codes.

 
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im guesing you are talking about the check engine light codes. generally nothing will happen thsoe codes will probably come back after driving the car agian and you will get a check engine like. but if your not talking about check engine codes and talking about say maybe stereo codes for the anti theft mode. well if yuo bought the car is should come with the code to unlock the stereo or drive it to the dealer and they can tell you the code to the stereo. if you need teh whole car reprogramed for instance for use of your key chain to lock and unlock the car then you wil have to go to dealer to get those set back to the car again and that will cost you a bit of money

 
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Nothing, all you should have to do is reset the radio. All computer codes should go back to initial, and the car will adjust itself as you drive.