The address range of a typical domestic router will be something like 192.168.0.1 to 192.168.0.255 . To secure the router properly so that only your devices can connect, you simply restrict the address range to the address of the router, typically 192.168.0.1 plus 1 additional address for each device, PC or network printer etc, that you have in your household.
So if for instance you had 2 PC's, 1 laptop, 1 network printer and a network media storage device that would be 5 devices plus the router making 6 in all. Then you would simply set the address range in your router to 192.168.0.1 to 192.168.0.6 and then restrict the issuance of each address to a particular mac address so that each of your devices are then tied to a particular address.
Cheers,
Iain.