The Arma 3 mods that we have been playing with on the Testing server is now on the Main Server. The same PlayWithSix profile also now connects to the Main Server. You don;y need to do anything new.
See Modifications Office Page for mods.
The Arma 3 Setup guide has also received content and should help new players get their Arma 3 working to our specifications. It is much simpler than Arma 2.