While replacing the alternator the wire sparked and now lights do not work and it will not start

More than likely you blew a fuse. There is no guarantee which one but since you have no lights and it won't start I suspect it is one of the fusible links. Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Also, below is the info on these links as you will see them on the wiring diagram.

Let us know what you find. Thanks