I have developing Forge Minecraft mods for some time now. I was wondering if it were possible to actually put them on a server. I can't seem to find a direct answer. I know that this may not be the place to put this but I am just dying to know. Please let me know if I can do it, and if so, how.
You can't turn a MC mod into a server plugin because Bukkit and Forge are different things (take it from a plugin dev); however, you can make a mod work on Forge servers.
When making a Forge server, all of your server's players will have to have the client mod, in addition to the Forge client, installed for it to work, so be prepared.
The first step is to actually install the server. Next, go to your Forge server folder, and upload the mod(s) into the folder. Then restart your server and boom, its there. Server mods can be found here.
So if you didn't want to read this, the gist of it is, no, you cannot, but your mods can be used on a Forge server, but not as plugins for a Bukkit or Spigot server, and that your players will need a clientside modpack. Hope this helped!