Below you can find a tutorial about adding support for any mod to CnCNet. No matter if you created the mod or if it's a random mod you found somewhere on the internet. Make sure you check the README.txt.
http://downloads.cncnet.org/ExampleMod.zip
Works for Tiberian Sun, Red Alert and Tiberian Dawn.
Note:
This is using my client, not rampa's client.
Differences: My main focus lies on simplicity, you just drop a few files into your game folder and play any mod you like online. You don't have to code an updater, you don't have to buy a server to push updates etc... My client will update itself, but won't touch your mod files, you set it up once and you'll have multiplayer support for many years to come without the need to take care of anything.
If you're just into singleplayer then use rampa's client instead, it offers way more modding features
