1. To make a free server in the Minecraft game, you should get the latest Java installed on your Windows PC. If you are having an outdated version of this software, you should download the latest version.
2. Prepare a location before you install the Minecraft server software on your PC. Doing this will help you to have all the configuration files stored in the folder you have created for this.
3. Once you have prepared a location, you can now download the Minecraft server software. What you are downloading should be a .jar or java file, but don't forget to save it directly to the folder you have created. You can click the files to see the configuration files.
4. The next stage is where you should enable the port forwarding. This will make the server you are setting to be accessible to players from different parts of the world. However, you might not need to do this if you are setting the server for local players.
5. Finally, you can start the server by using this command: java -Xmx1024M -Xms1024M -jar {server file name}.