Don't worry, we've got your back.
Get your API going.
Run sails generate foo. This will create a model Foo and controller FooController
Lift your app.
Run sails lift to start up your app. If you visit http://localhost:1337/foo in your browser, you'll see a socket.io-compatible REST API was generated for your 'Foo' model.
Dive in and start building.
From here, you can modify your models, create custom controller methods as Express middleware, and create custom routes (routes are set up in config/routes.js). Visit the Sails website for more information on next steps.