I personally find clementine a bit overkill for the microservice api projects. I actually haven’t used it in any of my projects, though I know people who have and liked it. The most important thing for the project you are on is to learn how to get a server running (Express.js is very simple) with working routes. When you are using a server, you must restart it when making changes. There are more advanced tools which you may encounter later on. One tool that is good to start with is the npm package called nodemon. This package automatically restarts your server when it sees changes to the files.
You will need a server file (usually named app.js or server.js), a routes file, and an html page to be served. You won’t need a database or the github authentication for this project. If you are still not comfortable with Express, checkout the expressjs website and follow the links under getting started.
Hopefully this points you in the right direction and don’t be afraid to ask people in the FreeCodeCamp/HelpBackEnd room on Gitter.