Luciano Mammino has a tutorial posted to his site showing you how to create a Lumen application that ties into a MySQL database from start to finish. It's a simple "display a famous quote" application, but it shows the full process you'll need to follow to hook it all together.

Lumen is a new Php micro-framework developed by Taylor Otwell, the same author of the famous Laravel framework. I wanted to give it a try and I am here to share my experimentations. I am not an expert of Lumen (yet), but I think one of the best characteristics of this framework is that it makes really really easy to bootstrap a new project. So to prove this, we will now build a fully functional app backed by a MySql database in less than 30 minutes. Are you ready to start?

His goal is a create a simple application that displays a quote, "randomized" based on the day. He shows you how to set up a new Lumen project, configure the database and create a migration to create the table in MySQL. He also includes the code for the data seeder and the main application routing (just two routes). Finally, he includes the output template and the CSS needed to make the end result look as expected.