This is where the documentation for the scoring hook will be located.
The following code is a snippet from the fuzzysearch.module, it is used as an example of how someone can easily return a score modifier for any node on the site.
The important part is that you use the same 'id' in both ops, this will ensure that the proper administrative settings will apply to the proper returned score. I also suggest that you name the beginning of your ids with the name of your module, as per Drupal coding standards to save namespace interference.
Also, note that multiple scores can be returned per module hook implementation. This is done by just including another $info and $score array with matching ids.
