New drive belt now will not start

Heard a bang as I was stopped at a light. Under the hood it started smoking and the car turned off. I pushed it to a place I could park it. I left the car for about 2-3 hours.I came back to car and I looked under the front and I could see the drive-belt had blown off. I tried the key and it started right up. I tried to make it home. I didn't realize the implications of the drive belt off and I had the music turned up and I noticed the battery light stayed on too. Then after leaving the store and attempting to start it I noticed it barely did and the lights were dimmer. So as I am driving home the car goes out on me. Loses all its juice. I drift to a spot that I can park it. Then I Googled the drive belt and I saw that it rums the alternator. That is when I realized what had happened and why it started again and then died. Ok so I put on a new drive belt by using a tool to release the tensioner. Tried to start it and nothing. Called friend who tried to give me a jump. Nothing triple a comes and tests battery and tries to jump it. Nothing. Did I kill the alternator? What else could it be? Anything a novice like myself can do to find out why or what is the reason it wont turn over at all when trying to start?