Since it looks like you're just starting out D8 development, additionally to drupal route:debug command I would install devel and admin toolbar modules that help out a lot in dev. Once devel is installed you could checkout the routing information at the taskbar and see all available paths to be sure your new module path is registered.

Another thing you might wanna take a look at is turning cache of completely on your local to see your changes immediately. Take a look at [this][1] guide for that.


  [1]: https://www.drupal.org/node/2598914