First off, i understand that your not a native speaker being from Pakistan but your going to want to at least learn some of the more common terminology.
This "Sharer" your speak of is actually a Router. The Router is not going to do much other then create an internal network, the game you are playing will need to be able to support LAN as an option for optimal gaming with people on the same network. Generals should support LAN gaming, just have someone host the game and your good to go.
As recommended, not all Routers are created equally and its best to do a little research into what is available to you before you buy. When you get one, update this thread and let us know how it goes.
Cheers.