Download the "universal jar" installer from the Fabric website and run it on your PC.
Click the Server Tab in the fabric installer and extract the server files.
Select the Minecraft Version you wish to run and the loader version you need to run
Select the folder you want to extract the server files to.
Click the Install button
Once the "Server successfully installed" windows appears, press the button to "Download server jar"
Once it has finished, click done and close out the Fabric Installer.
Navigate to where you extracted the server files.
Rename the "fabric-server-launch.jar"
If you are running Minecraft 1.0-1.11.2, rename it to custom-1112below.jar
If you are running Minecraft 1.12-1.16.5, rename it to custom.jar
If you are running Minecraft 1.17.X, rename it to custom-java-16.jar
If you are running Minecraft 1.18+, rename it to custom-java-17.jar
Upload the Fabric server files to your server using an FTP client https://hosthavoc.com/billing/knowledgebase/35/How-to-set-up-an-FTP-client-to-manage-your-serverandsharp039s-files.html
In your server's control panel, Select one of the "Custom Jar File" options in the Jar File dropdown menu depending on the version of Minecraft you are running.
Click the Save option in the server's control panel.
Accept the Minecraft EULA if you haven't already done so.
After you have fabric setup and working correctly, you would upload the mod files to the server using an FTP client.
Mod .jar files will usually go into the Mods folder
