You are able to set your custom endpoint path in the serverless.yml file if you do not want to use the console or API. You will have to set up your environment Alias in the console but here you can set the path and method for your individual functions to be mapped to.
Here is a sample function from a yml file. As you can see at the bottom of the file we have listed an endpoint with a path and method. Both of these will need to be set in order to be deployed properly
hello: runtime: nodejs8.3 handler: handler.main memory: 128 timeout: 30 access: public endpoint: path: /home method: get
For more information on how to set up endpoint alias and patterns check out our documentation here.