The Vert.x community offers a template project structure from that can be cloned. Since you will likely want to use (Git) version control as well, the fastest route is to clone the repository, delete its folder and then create a new Git repository:

The project offers a sample verticle as well as a unit test. You can safely delete all .java files beneath src/ to hack on the wiki, but before doing so you may test that the project builds and runs successfully: